50118.71SnTin
Tin (Sn) — element 50post-transition metal · group 14, period 5
Tin is a chemical element with the symbol Sn and atomic number 50. It is a post-transition metal in group 14, period 5 of the periodic table (the p-block), with a standard atomic mass of 118.71 u. At room temperature (25 °C) tin is a solid.
💡 Known for: Used since the Bronze Age; found in solder, tin-plated food cans and bronze.
# Tin properties
| Symbol | Sn |
|---|---|
| Atomic number | 50 |
| Atomic mass | 118.71 u |
| Category | post-transition metal |
| Group | 14 |
| Period | 5 |
| Block | p-block |
| Electron configuration | [Kr] 4d¹⁰ 5s² 5p² |
| Full configuration | 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p² |
| Electrons per shell | 2, 8, 18, 18, 4 |
| Protons / electrons | 50 / 50 |
| State at 25 °C | solid |
| Melting point | 505.08 K (231.9 °C, 449.5 °F) |
| Boiling point | 2875 K (2601.8 °C, 4715.3 °F) |
| Density | 7.287 g/cm³ |
| Electronegativity (Pauling) | 1.96 |
| First ionization energy | 7.344 eV |
| Atomic radius | 145 pm |
| Discovered | known since ancient times |
# Electron configuration of tin
The electron configuration of tin is [Kr] 4d¹⁰ 5s² 5p², written out in full as 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p². Its 50 electrons fill 5 shells as 2, 8, 18, 18, 4, so the outermost shell holds 4 electrons. As a group 14 element, tin has 4 valence electrons.
# Related elements
InIndiumprevious elementSbAntimonynext elementCCarbongroup 14SiSilicongroup 14GeGermaniumgroup 14PbLeadgroup 14FlFleroviumgroup 14AlAluminiumpost-transition metalGaGalliumpost-transition metalTlThalliumpost-transition metalBiBismuthpost-transition metalPoPoloniumpost-transition metalNhNihoniumpost-transition metalMcMoscoviumpost-transition metalLvLivermoriumpost-transition metal
# Tin FAQ
What is the atomic number of tin?
The atomic number of tin is 50: every tin atom has 50 protons in its nucleus. Its symbol is Sn.
What is the atomic mass of tin?
The standard atomic mass of tin is 118.71 u.
What is the electron configuration of tin?
Tin's electron configuration is [Kr] 4d¹⁰ 5s² 5p² (1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p²), with 2, 8, 18, 18, 4 electrons per shell.
Is tin a metal?
Yes. Tin is a post-transition metal, one of the metals.
What is the melting point of tin?
Tin melts at 505.08 K (231.9 °C, 449.5 °F) and boils at 2875 K (2601.8 °C, 4715.3 °F).
What is tin used for / known for?
Used since the Bronze Age; found in solder, tin-plated food cans and bronze.