50 Sn Tin 118.71
Post-transition metal p-block Period 5 Group 14

Tin

Sn · Element 50 · Carbon group

Bronze's other half: tin turned the Stone Age into the Bronze Age.

STATE AT 20°C Solid
ATOMIC MASS 118.71 u
ELECTRON CONFIGURATION [Kr] 4d¹⁰ 5s² 5p²

Structure

The tin atom

Not a diagram of dots on rings — a Monte-Carlo sample of the actual probability density |ψ|² for each occupied subshell. Drag to rotate. Blue and violet mark opposite signs of the wavefunction, which is what makes bonding possible.

Orbital cloud

Measured values

Property sheet

Every bar shows where tin sits among all 118 elements for that property.

Physical

Density 7.265 g/cm³ 47%
Melting point 505.1 K 25%
Boiling point 2875 K 57%
Specific heat 0.228 J/g·K
Thermal conductivity 66.8 W/m·K 72%

Atomic

Atomic radius 140 pm 33%
Covalent radius 139 pm
Van der Waals radius 217 pm

Electronic

Electronegativity 1.96 67%
Ionisation energy 708.2 kJ/mol 50%
Electron affinity 107.1 kJ/mol 79%

Occurrence

Abundance in crust 2.3 mg/kg 58%

Identity

SymbolSn
Atomic number50
Atomic mass118.71 u
CategoryPost-transition metal
Blockp
Crystal structuretetragonal
Oxidation states-4, -3, -2, -1, 0, +1, +2, +3, +4
Discoveredancient
Discovered byKnown since antiquity

Sources: IUPAC 2021 standard atomic weights · CRC Handbook of Chemistry and Physics · NIST. Values marked ~ are predicted rather than measured.

Size, to scale

How big is a tin atom?

Radius 140 pm — that is 0.14 nm, so about 3571 million of them side by side would span a millimetre.

Thermal range

Solid, liquid, gas — and when

Tin is liquid over a 2370 K window, from 505 K to 2875 K.

Where it sits

Position in the table

Tin sits in period 5, group 14. Everything in group 14 shares the same outer-electron count, which is why they behave so similarly.

OTHER POST-TRANSITION METALS

All post-transition metals

The story

What tin is, and how we found it

Bronze's other half: tin turned the Stone Age into the Bronze Age.

The discovery of tin

Ancient Discovery - The Dawn of Metallurgy

Prehistoric Beginnings (3200 BCE)

Tin's discovery predates recorded history, emerging during humanity's first experiments with metallurgy. Archaeological evidence from Turkey, Iran, and the Balkans shows tin bronze artifacts dating to 3200 BCE, marking humanity's transition from the Stone Age to the Bronze Age.

The Bronze Age Revolution

Ancient metallurgists discovered that adding 10-12% tin to copper created bronze - harder, more durable, and easier to cast than pure copper. This discovery was so transformative that it defined an entire era of human civilization lasting over 2,000 years.

"He was the first to mix tin with copper and thus invent bronze, which surpassed both metals in usefulness." - Ancient Greek writings about early metallurgy

Phoenician Tin Trade

The Phoenicians became master tin traders around 1200 BCE, establishing trade routes from Cornwall, England (the "Cassiterides" or "Tin Islands") to the Mediterranean. Their purple-dyed ships carried precious tin that was worth its weight in silver.

Roman Empire & Tin

Romans called tin "plumbum album" (white lead) and heavily exploited British tin mines. Cornwall became the Roman Empire's primary tin source, with complex mining operations that included hydraulic mining and sophisticated smelting techniques.

Scientific Understanding

Antoine Lavoisier (1789) first properly identified tin as a chemical element in his groundbreaking work "Elements of Chemistry." He distinguished it from other metals and established its place in the emerging understanding of chemical elements.

Industrial Revolution Impact

The Industrial Revolution transformed tin from a luxury material to an industrial necessity:

  • 1810: Peter Durand invented the tin can for food preservation
  • 1820s: Hot-dip tinning process developed for large-scale tin plating
  • 1876: First tin can manufacturing machine revolutionized food packaging

Modern Discovery of Deposits

Major tin discoveries shaped global economics:

  • 1850s: Massive tin deposits found in Malaysia and Indonesia
  • 1870s: Bolivian tin mines discovered at high altitude
  • 1980s: Chinese tin reserves identified as world's largest
Historical Impact: Tin's discovery and mastery directly enabled the rise of ancient civilizations, from Egyptian bronze tools to Roman military equipment. No other metal discovery had such a profound impact on human technological development!

Applications

What tin is used for

Industrial Applications

Tin Plating Revolution: Tin's most famous application is in tin-plated steel for food cans, protecting over 300 billion cans worldwide annually. The thin tin coating prevents corrosion and maintains food safety for years, revolutionizing food preservation and global trade.

Electronics & Soldering

Modern electronics depend on tin-based solders, particularly SAC alloys (tin-silver-copper) used in lead-free soldering. Every smartphone, computer, and electronic device contains hundreds of tin solder joints connecting components to circuit boards.

Alloy Manufacturing

  • Bronze Production: Tin transforms copper into bronze (8-12% tin), creating the alloy that defined an entire age of human civilization
  • Pewter Crafting: High-tin content pewter (85-99% tin) for decorative items and historical artifacts
  • Bearing Alloys: Babbitt metal containing 80-90% tin for low-friction engine bearings
  • Type Metal: Tin-lead alloys for printing type and linotype machines

Chemical Applications

Organotin Compounds: Used as catalysts in polyurethane foam production, PVC stabilizers, and formerly as marine antifouling agents (now restricted due to environmental concerns).

Glass Industry

Float Glass Process: Molten glass floats on molten tin baths to create perfectly flat sheets for windows and mirrors, producing over 95% of the world's flat glass.

Protective Coatings

Tin coatings provide corrosion resistance for steel in harsh environments, from food processing equipment to marine applications. Hot-dip tinning and electroplating are primary application methods.

Everyday Applications

Food & Kitchen

  • Tin Cans: Protecting billions of food products worldwide - from soup to pet food
  • Baking Molds: Tin-lined copper molds for professional baking and confectionery
  • Food-Safe Coatings: Interior can linings preventing metal taste and contamination
  • Pewter Tableware: Plates, cups, and serving pieces for special occasions

Electronics

  • Solder Joints: Connecting electronic components in phones, computers, and appliances
  • Circuit Boards: Tin plating on copper traces for oxidation protection
  • Component Leads: Tin coating on electronic component pins for easy soldering

Construction & Tools

  • Roofing Materials: Terne-coated steel for durable, weather-resistant roofing
  • Plumbing Solder: Lead-free tin-based solders for water pipe connections
  • Decorative Items: Tin signs, vintage advertising, and folk art pieces

Automotive

  • Engine Bearings: Tin-based Babbitt metal for smooth, low-friction operation
  • Fuel Tank Coatings: Corrosion protection for gasoline and diesel storage
  • Electronic Systems: Solder connections in automotive electronics and sensors

Arts & Crafts

  • Pewter Crafting: Handmade jewelry, decorative objects, and collectibles
  • Stained Glass: Tin-lead came for joining glass pieces in artistic windows
  • Model Making: Tin soldiers, miniatures, and hobby casting
Did You Know? The phrase "tin ear" doesn't refer to actual tin - it comes from the metallic, flat sound of cheap tin vessels compared to quality ceramics or silver!

Where it comes from

Natural occurrence

2.3 mg/kg of Earth's crust · more abundant than 58% of elements

Global Distribution

Primary Mineral: Cassiterite

Cassiterite (SnO₂) is virtually the only commercial source of tin, containing up to 78.8% tin by weight. This heavy, lustrous mineral forms distinctive brown to black crystals and is often found in granite-related environments.

Major Deposits Worldwide

  • China: Produces 40% of world's tin, primarily from Yunnan Province's Gejiu district - known as the "Tin Capital of the World"
  • Indonesia: Bangka and Belitung islands contain extensive alluvial tin deposits
  • Myanmar (Burma): Historic source with rich cassiterite deposits in granite formations
  • Bolivia: High-altitude mines in the Andes Mountains, particularly around Oruro
  • Peru: Significant tin production from the Andes region
  • Brazil: Rondônia state produces tin from both hard rock and placer deposits

Geological Formation

Tin deposits form through hydrothermal processes when tin-bearing fluids from cooling granite intrusions deposit cassiterite in surrounding rocks. These deposits often occur in:

  • Greisen: Altered granite with quartz, mica, and cassiterite
  • Skarn deposits: Contact metamorphic zones around granite intrusions
  • Placer deposits: Weathered cassiterite concentrated in river gravels
  • Vein systems: Cassiterite in quartz veins cutting through granite

Alluvial Mining

Much of the world's tin comes from alluvial deposits where weathering has concentrated cassiterite in river gravels and coastal sediments. Malaysia's historic tin mining industry was built on such deposits.

Abundance & Rarity

Tin ranks as the 47th most abundant element in Earth's crust at about 2.3 ppm, making it rarer than lead but more common than silver. Its concentration in economic deposits requires specific geological conditions, making tin mines relatively uncommon globally.

Cosmic Perspective: Tin forms through stellar nucleosynthesis in massive stars and is scattered through space during supernova explosions, eventually incorporating into new planetary systems.

Handling

Safety

Tin Safety Profile

Generally Safe Metal

Metallic tin is considered low-toxicity and safe for food contact applications. The FDA approves tin-plated containers for food storage, and tin has been used safely in cooking vessels for centuries.

Food Safety

  • Safe Exposure: Daily tin intake from food cans (0.1-1.0 mg) is well below toxic levels
  • Natural Occurrence: Tin naturally occurs in many foods at trace levels
  • No Bioaccumulation: Body efficiently eliminates excess tin through normal metabolism

Organotin Compounds - CAUTION

Organic tin compounds are significantly more toxic than metallic tin and require careful handling:

  • Tributyltin (TBT): Formerly used in marine paints, now banned due to environmental toxicity
  • Industrial Use: PVC stabilizers and catalysts require protective equipment
  • Environmental Impact: Some organotin compounds persist in sediments and bioaccumulate

Workplace Safety

  • Tin Dust: Prolonged inhalation may cause "stannosis" - benign lung deposits
  • Protective Equipment: Use dust masks when grinding or machining tin alloys
  • Soldering Safety: Ensure adequate ventilation to avoid flux fume inhalation
  • Skin Contact: Metallic tin causes no skin irritation or sensitization

Physical Hazards

  • Tin Cry: Pure tin makes a distinctive "cry" when bent - low-hazard but indicates stress
  • Melting Point: Low melting point (232°C) makes tin easy to work but requires care with hot surfaces

Environmental Considerations

  • Recyclable: Tin is 100% recyclable without quality loss
  • Low Environmental Impact: Metallic tin poses minimal environmental threat
  • Sustainable Use: Tin can coatings are extremely thin, minimizing resource consumption
Safety Tip: While metallic tin is very safe, always use proper ventilation when soldering and avoid exposure to organotin industrial chemicals.

Quick answers

Tin: common questions

What is Tin?

Tin (symbol Sn) is element 50 on the periodic table, a post-transition metal in period 5, group 14. Bronze's other half: tin turned the Stone Age into the Bronze Age. At room temperature it is a solid.

What is the electron configuration of Tin?

Tin's ground-state electron configuration is [Kr] 4d¹⁰ 5s² 5p², giving 5 occupied shells holding 2, 8, 18, 18, 4 electrons respectively. Its outer shell holds 4 electrons, which is what sets its bonding behaviour.

What are the melting and boiling points of Tin?

Tin melts at 505.1 K (231.9 °C) and boils at 2875 K (2601.9 °C).

What is the atomic mass of Tin?

The standard atomic weight of Tin is 118.71 u. That is a weighted average across its naturally occurring isotopes, which is why it is rarely a whole number.

How dense is Tin?

Tin has a density of 7.265 g/cm³. Water is 1.0 g/cm³, so a block of tin is about 7.3× heavier.

What is the electronegativity of Tin?

Tin has a Pauling electronegativity of 1.96. The scale runs from 0.70 (francium, the least greedy for electrons) to 3.98 (fluorine, the most). Values in this middle band tend to form covalent rather than strongly ionic bonds.

Who discovered Tin, and when?

Tin has been known since antiquity — it occurs in a form usable without smelting, so no single person can be credited with its discovery. The name comes from anglo-Saxon tin; symbol from Latin stannum.

How common is Tin on Earth?

Tin makes up about 2.3 mg/kg of the Earth's crust — uncommon, but not rare.