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.
Structure
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.
Measured values
Every bar shows where tin sits among all 118 elements for that property.
Sources: IUPAC 2021 standard atomic weights · CRC Handbook of Chemistry and Physics · NIST. Values marked ~ are predicted rather than measured.
Size, to scale
Radius 140 pm — that is 0.14 nm, so about 3571 million of them side by side would span a millimetre.
Thermal range
Tin is liquid over a 2370 K window, from 505 K to 2875 K.
The story
Bronze's other half: tin turned the Stone Age into the Bronze Age.
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.
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
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.
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.
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.
The Industrial Revolution transformed tin from a luxury material to an industrial necessity:
Major tin discoveries shaped global economics:
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.
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.
Organotin Compounds: Used as catalysts in polyurethane foam production, PVC stabilizers, and formerly as marine antifouling agents (now restricted due to environmental concerns).
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.
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.
Where it comes from
2.3 mg/kg of Earth's crust · more abundant than 58% of elements
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.
Tin deposits form through hydrothermal processes when tin-bearing fluids from cooling granite intrusions deposit cassiterite in surrounding rocks. These deposits often occur in:
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.
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
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.
Organic tin compounds are significantly more toxic than metallic tin and require careful handling:
Quick answers
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.
[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.Tin melts at 505.1 K (231.9 °C) and boils at 2875 K (2601.9 °C).
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.
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.
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.
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.
Tin makes up about 2.3 mg/kg of the Earth's crust — uncommon, but not rare.