Tin (Sn)
Element 50 · post-transition metal · group 14, period 5
Tin is element 50, a post-transition metal in group 14 and period 5. Its electron configuration is [Kr] 4d10 5s2 5p2. That leaves 4 valence electrons in the outer shell, with the shells filling 2, 8, 18, 18, 4. With 4 to gain and 4 to lose it is equally far from either, so it shares electrons in covalent bonds rather than forming ions. The charges listed for it, +2, +4, are oxidation states rather than charges it usually carries.
- 50 protons
- 4 valence e−
- +2, +4
- p-block
Properties
| Atomic number | 50 |
|---|---|
| Symbol | Sn |
| Standard atomic weight | 118.71 u |
| Group | 14 |
| Period | 5 |
| Block | p-block |
| Category | post-transition metal |
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p2 |
| Noble-gas notation | [Kr] 4d10 5s2 5p2 |
| Electrons per shell | 2, 8, 18, 18, 4 |
| Valence electrons | 4 |
| Common ionic charge | +2, +4 |
| Electronegativity (Pauling) | 1.96 |
| Protons / electrons | 50 / 50 |
Electron configuration of tin
Orbitals fill from the lowest energy upward. Writing that out for tin gives 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p2, which is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p2 in plain text.
Everything up to Kr is the same as in that noble gas, so it is usually abbreviated to [Kr] 4d10 5s2 5p2. The part outside the bracket is what does the chemistry.
| Subshell | Electrons | Capacity |
|---|---|---|
| 1s | 2 | 2 |
| 2s | 2 | 2 |
| 2p | 6 | 6 |
| 3s | 2 | 2 |
| 3p | 6 | 6 |
| 3d | 10 | 10 |
| 4s | 2 | 2 |
| 4p | 6 | 6 |
| 4d | 10 | 10 |
| 5s | 2 | 2 |
| 5p | 2 | 6 |
Tin ion charge
Tin commonly forms ions with a charge of +2, +4.
It has 4 valence electrons, which puts it exactly as far from an empty outer shell as from a full one. Neither route is shorter, so it does not hand electrons over at all - it shares them, which is why it forms 4 covalent bonds. The values above are oxidation states rather than charges it normally carries.
Common questions
How many valence electrons does tin have?
Tin has 4 valence electrons. For a main-group element the count is the group number minus 10, and tin is in group 14.
What is the electron configuration of tin?
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p2, or [Kr] 4d10 5s2 5p2 written from the previous noble gas. Orbitals fill lowest energy first.
What is the charge of tin?
Tin commonly forms ions with a charge of +2, +4. With 4 valence electrons it is exactly as far from an empty shell as from a full one, so neither route is shorter and it shares electrons instead. Those values are oxidation states, not charges it normally carries.
How many protons, electrons and neutrons does tin have?
A neutral tin atom has 50 protons and 50 electrons. Its standard atomic weight is 118.71, so the most common isotope has about 69 neutrons.
Nearby elements
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