Tin (Sn)
Tin is the 50th element, a post-transition metal in the p-block. Its standard atomic weight is 118.711.
Tin
118.711
What the table records
- Atomic number
- 50
- Standard atomic weight
- 118.711
- Group
- 14
- Period
- 5
- Block
- p-block
- Category
- Post-transition metal
- [Kr] 4d10 5s2 5p2
- Valence electrons
- 4
- Typical valence
- 2
- Van der Waals radius
- 2.25 Å
- Covalent radius
- 1.39 Å
Molecules containing tin
The lightest named structures in this library that contain Sn.
Stannous cation
Sn+2 · 118.71 g/mol
Tin atom
Sn · 118.71 g/mol
TIN OXIDE (SnO)
OSn · 134.71 g/mol
Vinylstannane
C₂H₆Sn · 148.78 g/mol
Trimethyltin(1+)
C₃H₉Sn+ · 163.82 g/mol
Monobutyltin
C₄H₉Sn+3 · 175.83 g/mol
Tetramethyltin
C₄H₁₂Sn · 178.85 g/mol
Stannous Chloride
Cl₂Sn · 189.62 g/mol
Trimethyltin chloride
C₃H₉ClSn · 199.27 g/mol
(Dibutyl)stannane
C₈H₁₈Sn+2 · 232.94 g/mol
(1-Ethoxyethenyl)(trimethyl)stannane
C₇H₁₆OSn · 234.92 g/mol
Tetraethyltin
C₈H₂₀Sn · 234.96 g/mol
How to read these numbers
The standard atomic weight is an average over the isotopes as they occur naturally, which is why it is rarely a whole number. It is the figure a molar mass calculation uses. Work in mass spectrometry wants the monoisotopic mass of a single isotope instead, which is a different number.
The two radii are not the same measurement. The covalent radius is half the distance between two bonded atoms of the element; the van der Waals radius is how close a non-bonded atom gets before repulsion takes over, and is always the larger. Space-filling models are drawn with the second, ball-and-stick models with the first — which is why the same molecule looks so different in the two.