5
B
Boron

Boron

Element 5 • Metalloid
Atomic Mass 10.810000
Electron Config [He] 2s² 2p¹
Group/Period 13/2

Overview

ANALYZED
Hard metalloid essential for plant growth. Forms extremely hard compounds.

Physical Properties

MEASURED
Atomic Mass
10.810000 u
Density
2.3700 g/cm³
Melting Point
2348.00 °C
Boiling Point
4273.00 °C
Electronegativity
2.04
Electron Configuration
[He] 2s² 2p¹
Ionization Energy
8.30 kJ/mol

Special Properties

CLASSIFIED
STABLE Generally safe to handle with standard precautions
Earth Abundance: 1.00e-5
Universe Abundance: 1.00e-10

Applications

CATALOGUED

Advanced Materials & Composites

Boron is the invisible superhero of modern technology, quietly enabling everything from bulletproof armor to smartphone screens. Its unique chemical properties make it indispensable in cutting-edge applications where ordinary materials fail.

Armor & Defense Technology

Boron carbide (B₄C) is the third-hardest material known to humanity, surpassed only by diamond and cubic Boron nitride. Military contractors like BAE Systems and General Dynamics use Boron carbide in:

  • Body armor: Lightweight ceramic plates that stop armor-piercing bullets while being 50% lighter than steel
  • Vehicle armor: M1 Abrams tank modules and armored personnel carriers
  • Helicopter armor: Apache and Black Hawk crew protection systems
  • Naval applications: Warship hull reinforcement and submarine components

Nuclear Technology

Boron's incredible neutron-absorbing ability makes it the ultimate nuclear control material. Boron-10 has a neutron absorption cross-section 1,000 times greater than most materials:

  • Control rods: Boron carbide rods regulate nuclear reactions in power plants worldwide
  • Neutron shielding: Borated polyethylene protects workers from radiation exposure
  • Emergency shutdown: Liquid boric acid solutions can instantly stop runaway nuclear reactions
  • Spent fuel storage: Borated steel containers safely store radioactive waste

Glass & Ceramics Revolution

Borosilicate glass transformed laboratory science and consumer products. Corning Inc. revolutionized glassmaking with Boron-enhanced formulations:

  • Laboratory glassware: Pyrex beakers and flasks that resist thermal shock
  • Consumer cookware: Oven-safe dishes that withstand 500°C temperature changes
  • Optical instruments: Telescope mirrors and precision lenses with minimal thermal expansion
  • Smartphone screens: Gorilla Glass contains Boron for scratch resistance

Agricultural Enhancement

Boron is an essential plant micronutrient that enables cellular wall formation and reproductive processes. Modern agriculture relies on Boron compounds for:

  • Fertilizers: Boric acid and sodium borate boost crop yields by 15-30%
  • Fruit production: Apple, citrus, and grape crops require Boron for proper fruit development
  • Soil amendment: Corrects Boron deficiency in over 80 crops worldwide

Common Uses

INDEXED

Household Products

  • Cleaning products: Borax (sodium borate) in laundry detergents like 20 Mule Team Borax, dishwasher tablets
  • Pest control: Boric acid ant baits, cockroach powders, and termite treatments
  • Personal care: Eye drops, contact lens solutions, and antiseptic treatments
  • Cookware: Pyrex glass dishes, measuring cups, and laboratory-grade bakeware

Fire Retardants & Safety

  • Building materials: Boron-treated lumber for fire-resistant construction
  • Textiles: Fire-retardant clothing, curtains, and upholstery fabrics
  • Insulation: Cellulose insulation treated with boric acid for homes and commercial buildings
  • Automotive: Brake fluids and hydraulic systems using Boron compounds

Agriculture & Gardening

  • Plant nutrition: Boron fertilizers for vegetables, fruits, and ornamental plants
  • Soil conditioners: Products like Solubor and Granubor for professional farming
  • Hydroponics: Nutrient solutions for soilless growing systems
  • Tree care: Boron supplements for fruit trees and forest management

Scientific & Medical Applications

  • Laboratory equipment: Borosilicate glassware, test tubes, and reaction vessels
  • Medical devices: Neutron capture therapy for cancer treatment
  • Analytical chemistry: Buffer solutions and pH standards
  • Research tools: High-temperature reaction vessels and precision instruments

Specialty Applications

  • Jewelry: Synthetic diamonds created using Boron catalysts
  • Metallurgy: Steel hardening and alloy improvement agents
  • Electronics: Semiconductor doping and high-temperature components
  • Pyrotechnics: Green-colored fireworks and flares using Boron compounds

Natural Occurrence

SURVEYED

Cosmic Rarity

Boron is one of the universe's rarest elements, with an abundance of only 10 parts per million in Earth's crust. This scarcity tells a fascinating story of cosmic destruction and terrestrial concentration.

Stellar Destruction Origins

Unlike most elements, Boron cannot survive inside stars - it's destroyed at temperatures above 500,000K. Instead, Boron forms through cosmic ray spallation, when high-energy particles smash into carbon, nitrogen, and oxygen nuclei in space, fragmenting them into lighter elements including Boron. This violent process makes Boron a "fossil" of cosmic ray activity over billions of years.

Terrestrial Concentration

Despite its cosmic rarity, Boron becomes concentrated in specific geological environments through unique processes:

Primary Mineral Deposits

Evaporite deposits contain the world's major Boron resources:

  • Borax (Na₂B₄O₇·10H₂O): The famous "white gold" of Death Valley, California, where 19th-century twenty-mule teams hauled borax across the desert
  • Kernite (Na₂B₄O₇·4H₂O): Discovered in California's Mojave Desert in 1926, creating the world's largest Boron mine
  • Ulexite (NaCaB₅O₉·8H₂O): "TV rock" with natural fiber-optic properties, found in Chile and Nevada
  • Colemanite (Ca₂B₆O₁₁·5H₂O): Named after William T. Coleman, the "Borax King" of California

Global Distribution

Turkey dominates world Boron production with 73% of global reserves, primarily from the Kirka and Emet mines. The United States ranks second with California's Boron mine (owned by Rio Tinto), which has operated since 1872. Other significant deposits exist in:

  • Argentina: Salar de Olaroz and other salt lake deposits in the Andes
  • Chile: Atacama Desert salt flats with unique borate minerals
  • Russia: Siberian deposits formed by ancient volcanic activity
  • Peru: High-altitude borate deposits in the Andes mountains

Marine Sources

Seawater contains about 4.5 mg/L of Boron, making oceans a virtually infinite but dilute source. Some geothermal springs concentrate Boron to economically viable levels - Italy's Larderello geothermal field was the world's first source of industrial Boron in the 1800s.

Biological Concentration

Certain plants act as "Boron accumulators," concentrating the element up to 1,000 times above soil levels. Marine algae and some desert plants evolved this ability to tolerate high Boron environments that would kill other organisms.

Discovery

ARCHIVED
1808

The Alchemical Breakthrough

The discovery of boron emerged from the golden age of chemistry when brilliant minds raced to unlock the secrets of mysterious compounds. This story involves French revolutionaries, English experimenters, and a substance that had puzzled humanity for over a thousand years.

Ancient Borax Mystery (800 CE - 1800)

Long before its discovery, boron compounds tantalized civilizations across the globe. Borax reached Europe via the ancient Silk Road, traded as a precious flux for metalworking and a component in Chinese ceramics. Arab alchemists called it "burak," while Venetian glassmakers paid premium prices for this mysterious white powder that made their glass crystal clear.

Marco Polo wrote about borax mines in Tibet, and medieval European alchemists tried desperately to understand why this "magical salt" could clean, preserve, and transform other materials. They had no idea they were working with compounds of an unknown element.

The French Revolution Connection (1808)

The breakthrough came during one of history's most turbulent periods. Joseph Louis Gay-Lussac and Louis-Jacques Thénard, working in Napoleon's France, were investigating the mysterious properties of boric acid. These brilliant chemists had survived the French Revolution and were now pushing the boundaries of chemical knowledge under the patronage of the French Academy of Sciences.

On June 21, 1808, they achieved the impossible - they isolated pure boron by heating boric acid with potassium metal in an iron tube. Gay-Lussac later wrote: "We obtained a substance of an olive-brown color, which appeared to us to be the radical of boracic acid." They had created element number 5, though they didn't yet understand its true significance.

The English Competition (1808)

Simultaneously, across the English Channel, Sir Humphry Davy was conducting his own groundbreaking experiments at the Royal Institution in London. Just nine days after the French success, Davy achieved the same result using a different method - electrolysis of boric acid. The scientific rivalry between revolutionary France and Napoleonic-era Britain drove both teams to unprecedented achievements.

Davy's approach was more elegant but equally dangerous. He passed electric current through molten boric acid, depositing tiny amounts of brown material at the electrode. His meticulous notes describe "a dark olive-colored powder" that burned with a brilliant green flame - the first recorded observation of boron's characteristic green emission.

The Naming Controversy

Both French and English chemists initially struggled to name their discovery. The French team proposed "bore" from the Arabic "burak" (borax), while Davy suggested "boracium." The modern name "boron" emerged from international scientific cooperation, combining the Arabic root with the Greek suffix "-on" meaning "forming."

Industrial Revolution (1850s-1900s)

Boron remained a laboratory curiosity until the California Gold Rush era. In 1881, Francis Marion Smith discovered massive borax deposits in Death Valley, earning him the nickname "Borax King." His famous twenty-mule team wagons became an American legend, hauling borax 165 miles across the Mojave Desert to the nearest railroad.

The real breakthrough came in 1909 when Ezekiel Weintraub developed a method to produce pure crystalline boron, revealing its true properties as one of the hardest elements known. This discovery launched boron into the modern age of advanced materials and nuclear technology.

Safety Information

CRITICAL

Generally Safe with Pre
cautions

Boron and most Boron compounds are relatively low-toxicity materials compared to many industrial chemicals.

However, proper handling procedures are essential for safe use in laboratory, industrial, and household applications.

Toxicity Information

Acute toxicity: Boron compounds have low acute toxicity.

The LD₅₀ (lethal dose for 50% of test subjects) for boric acid is 2,660 mg/kg in rats, making it less
toxic than table salt.

Chronic exposure: Long-term exposure to high levels may affect reproductive health and development. OSHA has not established specific exposure limits for elemental Boron, but recommends treating it as a nuisance dust.

Specific Compound Hazards

Recommended Safety Measures

First Aid Procedures

Eye contact: Flush with clean water for 15 minutes, seek medical attention if irritation persists

Skin contact: Wash with soap and water, remove contaminated clothing

Inhalation: Move to fresh air, seek medical attention if breathing difficulties occur

Ingestion: Rinse mouth, drink water, seek medical attention for large amounts

Household Use Guidelines

Common household Boron compounds like borax are generally safe when used as directed:

Note: Boron is an essential micronutrient for plants and may have beneficial effects for human bone health, but dietary supplements should be used only under medical supervision.

Knowledge Database

Essential information about Boron (B)

Boron is unique due to its atomic number of 5 and belongs to the Metalloid category. With an atomic mass of 10.810000, it exhibits distinctive properties that make it valuable for various applications.

Its electron configuration ([He] 2s² 2p¹) determines its chemical behavior and bonding patterns.

Boron has several important physical properties:

Density: 2.3700 g/cm³

Melting Point: 2348.00 K (2075°C)

Boiling Point: 4273.00 K (4000°C)

State at Room Temperature: Solid

Atomic Radius: 87 pm

Boron has various important applications in modern technology and industry:

Advanced Materials & Composites

Boron is the invisible superhero of modern technology, quietly enabling everything from bulletproof armor to smartphone screens. Its unique chemical properties make it indispensable in cutting-edge applications where ordinary materials fail.

Armor & Defense Technology

Boron carbide (B₄C) is the third-hardest material known to humanity, surpassed only by diamond and cubic Boron nitride. Military contractors like BAE Systems and General Dynamics use Boron carbide in:

  • Body armor: Lightweight ceramic plates that stop armor-piercing bullets while being 50% lighter than steel
  • Vehicle armor: M1 Abrams tank modules and armored personnel carriers
  • Helicopter armor: Apache and Black Hawk crew protection systems
  • Naval applications: Warship hull reinforcement and submarine components

Nuclear Technology

Boron's incredible neutron-absorbing ability makes it the ultimate nuclear control material. Boron-10 has a neutron absorption cross-section 1,000 times greater than most materials:

  • Control rods: Boron carbide rods regulate nuclear reactions in power plants worldwide
  • Neutron shielding: Borated polyethylene protects workers from radiation exposure
  • Emergency shutdown: Liquid boric acid solutions can instantly stop runaway nuclear reactions
  • Spent fuel storage: Borated steel containers safely store radioactive waste

Glass & Ceramics Revolution

Borosilicate glass transformed laboratory science and consumer products. Corning Inc. revolutionized glassmaking with Boron-enhanced formulations:

  • Laboratory glassware: Pyrex beakers and flasks that resist thermal shock
  • Consumer cookware: Oven-safe dishes that withstand 500°C temperature changes
  • Optical instruments: Telescope mirrors and precision lenses with minimal thermal expansion
  • Smartphone screens: Gorilla Glass contains Boron for scratch resistance

Agricultural Enhancement

Boron is an essential plant micronutrient that enables cellular wall formation and reproductive processes. Modern agriculture relies on Boron compounds for:

  • Fertilizers: Boric acid and sodium borate boost crop yields by 15-30%
  • Fruit production: Apple, citrus, and grape crops require Boron for proper fruit development
  • Soil amendment: Corrects Boron deficiency in over 80 crops worldwide
1808

The Alchemical Breakthrough

The discovery of boron emerged from the golden age of chemistry when brilliant minds raced to unlock the secrets of mysterious compounds. This story involves French revolutionaries, English experimenters, and a substance that had puzzled humanity for over a thousand years.

Ancient Borax Mystery (800 CE - 1800)

Long before its discovery, boron compounds tantalized civilizations across the globe. Borax reached Europe via the ancient Silk Road, traded as a precious flux for metalworking and a component in Chinese ceramics. Arab alchemists called it "burak," while Venetian glassmakers paid premium prices for this mysterious white powder that made their glass crystal clear.

Marco Polo wrote about borax mines in Tibet, and medieval European alchemists tried desperately to understand why this "magical salt" could clean, preserve, and transform other materials. They had no idea they were working with compounds of an unknown element.

The French Revolution Connection (1808)

The breakthrough came during one of history's most turbulent periods. Joseph Louis Gay-Lussac and Louis-Jacques Thénard, working in Napoleon's France, were investigating the mysterious properties of boric acid. These brilliant chemists had survived the French Revolution and were now pushing the boundaries of chemical knowledge under the patronage of the French Academy of Sciences.

On June 21, 1808, they achieved the impossible - they isolated pure boron by heating boric acid with potassium metal in an iron tube. Gay-Lussac later wrote: "We obtained a substance of an olive-brown color, which appeared to us to be the radical of boracic acid." They had created element number 5, though they didn't yet understand its true significance.

The English Competition (1808)

Simultaneously, across the English Channel, Sir Humphry Davy was conducting his own groundbreaking experiments at the Royal Institution in London. Just nine days after the French success, Davy achieved the same result using a different method - electrolysis of boric acid. The scientific rivalry between revolutionary France and Napoleonic-era Britain drove both teams to unprecedented achievements.

Davy's approach was more elegant but equally dangerous. He passed electric current through molten boric acid, depositing tiny amounts of brown material at the electrode. His meticulous notes describe "a dark olive-colored powder" that burned with a brilliant green flame - the first recorded observation of boron's characteristic green emission.

The Naming Controversy

Both French and English chemists initially struggled to name their discovery. The French team proposed "bore" from the Arabic "burak" (borax), while Davy suggested "boracium." The modern name "boron" emerged from international scientific cooperation, combining the Arabic root with the Greek suffix "-on" meaning "forming."

Industrial Revolution (1850s-1900s)

Boron remained a laboratory curiosity until the California Gold Rush era. In 1881, Francis Marion Smith discovered massive borax deposits in Death Valley, earning him the nickname "Borax King." His famous twenty-mule team wagons became an American legend, hauling borax 165 miles across the Mojave Desert to the nearest railroad.

The real breakthrough came in 1909 when Ezekiel Weintraub developed a method to produce pure crystalline boron, revealing its true properties as one of the hardest elements known. This discovery launched boron into the modern age of advanced materials and nuclear technology.

Discovered by: <h3><i class="fas fa-magic"></i> The Alchemical Breakthrough</h3> <p>The discovery of boron emerged from the golden age of chemistry when brilliant minds raced to unlock the secrets of mysterious compounds. This story involves French revolutionaries, English experimenters, and a substance that had puzzled humanity for over a thousand years.</p> <h4>Ancient Borax Mystery (800 CE - 1800)</h4> <p>Long before its discovery, boron compounds tantalized civilizations across the globe. <strong>Borax</strong> reached Europe via the ancient Silk Road, traded as a precious flux for metalworking and a component in Chinese ceramics. Arab alchemists called it "burak," while Venetian glassmakers paid premium prices for this mysterious white powder that made their glass crystal clear.</p> <p>Marco Polo wrote about borax mines in Tibet, and medieval European alchemists tried desperately to understand why this "magical salt" could clean, preserve, and transform other materials. They had no idea they were working with compounds of an unknown element.</p> <h4>The French Revolution Connection (1808)</h4> <p>The breakthrough came during one of history's most turbulent periods. <strong>Joseph Louis Gay-Lussac</strong> and <strong>Louis-Jacques Thénard</strong>, working in Napoleon's France, were investigating the mysterious properties of boric acid. These brilliant chemists had survived the French Revolution and were now pushing the boundaries of chemical knowledge under the patronage of the French Academy of Sciences.</p> <p>On June 21, 1808, they achieved the impossible - they isolated pure boron by heating boric acid with potassium metal in an iron tube. Gay-Lussac later wrote: "We obtained a substance of an olive-brown color, which appeared to us to be the radical of boracic acid." They had created element number 5, though they didn't yet understand its true significance.</p> <h4>The English Competition (1808)</h4> <p>Simultaneously, across the English Channel, <strong>Sir Humphry Davy</strong> was conducting his own groundbreaking experiments at the Royal Institution in London. Just nine days after the French success, Davy achieved the same result using a different method - electrolysis of boric acid. The scientific rivalry between revolutionary France and Napoleonic-era Britain drove both teams to unprecedented achievements.</p> <p>Davy's approach was more elegant but equally dangerous. He passed electric current through molten boric acid, depositing tiny amounts of brown material at the electrode. His meticulous notes describe "a dark olive-colored powder" that burned with a brilliant green flame - the first recorded observation of boron's characteristic green emission.</p> <h4>The Naming Controversy</h4> <p>Both French and English chemists initially struggled to name their discovery. The French team proposed "bore" from the Arabic "burak" (borax), while Davy suggested "boracium." The modern name <strong>"boron"</strong> emerged from international scientific cooperation, combining the Arabic root with the Greek suffix "-on" meaning "forming."</p> <h4>Industrial Revolution (1850s-1900s)</h4> <p>Boron remained a laboratory curiosity until the California Gold Rush era. In 1881, <strong>Francis Marion Smith</strong> discovered massive borax deposits in Death Valley, earning him the nickname "Borax King." His famous twenty-mule team wagons became an American legend, hauling borax 165 miles across the Mojave Desert to the nearest railroad.</p> <p>The real breakthrough came in 1909 when <strong>Ezekiel Weintraub</strong> developed a method to produce pure crystalline boron, revealing its true properties as one of the hardest elements known. This discovery launched boron into the modern age of advanced materials and nuclear technology.</p>

Year of Discovery: 1808

Cosmic Rarity

Boron is one of the universe's rarest elements, with an abundance of only 10 parts per million in Earth's crust. This scarcity tells a fascinating story of cosmic destruction and terrestrial concentration.

Stellar Destruction Origins

Unlike most elements, Boron cannot survive inside stars - it's destroyed at temperatures above 500,000K. Instead, Boron forms through cosmic ray spallation, when high-energy particles smash into carbon, nitrogen, and oxygen nuclei in space, fragmenting them into lighter elements including Boron. This violent process makes Boron a "fossil" of cosmic ray activity over billions of years.

Terrestrial Concentration

Despite its cosmic rarity, Boron becomes concentrated in specific geological environments through unique processes:

Primary Mineral Deposits

Evaporite deposits contain the world's major Boron resources:

  • Borax (Na₂B₄O₇·10H₂O): The famous "white gold" of Death Valley, California, where 19th-century twenty-mule teams hauled borax across the desert
  • Kernite (Na₂B₄O₇·4H₂O): Discovered in California's Mojave Desert in 1926, creating the world's largest Boron mine
  • Ulexite (NaCaB₅O₉·8H₂O): "TV rock" with natural fiber-optic properties, found in Chile and Nevada
  • Colemanite (Ca₂B₆O₁₁·5H₂O): Named after William T. Coleman, the "Borax King" of California

Global Distribution

Turkey dominates world Boron production with 73% of global reserves, primarily from the Kirka and Emet mines. The United States ranks second with California's Boron mine (owned by Rio Tinto), which has operated since 1872. Other significant deposits exist in:

  • Argentina: Salar de Olaroz and other salt lake deposits in the Andes
  • Chile: Atacama Desert salt flats with unique borate minerals
  • Russia: Siberian deposits formed by ancient volcanic activity
  • Peru: High-altitude borate deposits in the Andes mountains

Marine Sources

Seawater contains about 4.5 mg/L of Boron, making oceans a virtually infinite but dilute source. Some geothermal springs concentrate Boron to economically viable levels - Italy's Larderello geothermal field was the world's first source of industrial Boron in the 1800s.

Biological Concentration

Certain plants act as "Boron accumulators," concentrating the element up to 1,000 times above soil levels. Marine algae and some desert plants evolved this ability to tolerate high Boron environments that would kill other organisms.

Earth's Abundance: 1.00e-5

Universe Abundance: 1.00e-10

General Safety: Boron should be handled with standard laboratory safety precautions including protective equipment and proper ventilation.

Generally Safe with Pre
cautions

Boron and most Boron compounds are relatively low-toxicity materials compared to many industrial chemicals.

However, proper handling procedures are essential for safe use in laboratory, industrial, and household applications.

Toxicity Information

Acute toxicity: Boron compounds have low acute toxicity.

The LD₅₀ (lethal dose for 50% of test subjects) for boric acid is 2,660 mg/kg in rats, making it less
toxic than table salt.

Chronic exposure: Long-term exposure to high levels may affect reproductive health and development. OSHA has not established specific exposure limits for elemental Boron, but recommends treating it as a nuisance dust.

Specific Compound Hazards

  • Boric acid: Mildly irritating to skin and eyes; ingestion of large amounts may cause nausea and vomiting
  • Borax: Can cause skin and respiratory irritation; avoid prolonged skin contact
  • Boron carbide: Inhalation of dust may cause respiratory irritation; use appropriate ventilation
  • Boron trifluoride: Highly
    toxic gas; requires specialized handling and emergency procedures

Recommended Safety Measures

  • Personal protection: Safety glasses, dust masks when handling powders, nitrile gloves for prolonged contact
  • Ventilation: Use fume hoods when heating Boron compounds or working with fine powders
  • Storage: Keep in dry, sealed containers away from incompatible materials
  • Housekeeping: Clean up spills promptly, avoid creating airborne dust

First Aid Procedures

Eye contact: Flush with clean water for 15 minutes, seek medical attention if irritation persists

Skin contact: Wash with soap and water, remove contaminated clothing

Inhalation: Move to fresh air, seek medical attention if breathing difficulties occur

Ingestion: Rinse mouth, drink water, seek medical attention for large amounts

Household Use Guidelines

Common household Boron compounds like borax are generally safe when used as directed:

  • Keep away from children and pets when using as pest control
  • Avoid creating dust clouds when applying powdered products
  • Store in original containers with clear labeling
  • Do not mix with other cleaning chemicals

Note: Boron is an essential micronutrient for plants and may have beneficial effects for human bone health, but dietary supplements should be used only under medical supervision.

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