Ion Si^2-

Symbol	Si2-
Number	14
Atomic weight	28.0840000
Latin name	Silicium
English name	Silicon

How to build an electronic configuration by yourself? See link

Electronic configuration of of Silicon

Si: 1s² 2s² 2p⁶ 3s² 3p² → Si^2-:1s²2s²2p⁶3s²3p⁴

Same electronic configuration has an ion of Silicon -2 and P^-1, S, Cl⁺¹

The order of filling the shells with electrons of Silicon (Si^2-): 1s → 2s → 2p → 3s → 3p → 4s → 3d → 4p → 5s → 4d → 5p → 6s → 4f → 5d → 6p → 7s → 5f → 6d → 7p.

On the sub level ‘s’ there might be 2 electrons at most, on ‘p’ - up to 6, on ‘d’ - up to 10 and up to 14 on ‘f’

Silicon has 14 electrons, let's fill electronic layers in described order:

2 electrons on 1s-sub level

2 electrons on 2s-sub level

6 electrons on 2p-sub level

2 electrons on 3s-sub level

4 electrons on 3p-sub level

Oxidation state of Silicon

Atoms of Silicon in compounds have an oxidation state of 4, 3, 2, 1, -1, -2, -4.

The oxidation state is the conditional charge of an atom in a compound: the bond in a molecule between atoms is based on the sharing of electrons, thus, if the atom’s charge virtually increases, then the oxidation state is negative (electrons carry a negative charge), if the charge decreases, then the oxidation state is positive.

Oxidation state of an ion Si^2- = -2

Ions of Silicon

Valence of Si^2-

Atoms of Silicon in compounds have valence IV, III, II, I.

Valence of Silicon is an ability of an atom Si to build chemical bounds. The valence is based on electronic configuration of atom: electrons participated in chemical bounds are known as valence electrons. In general the valence is:

The number of possible chemical bounds with other atoms

The valence has no sign.

Quantum numbers Si ^2-

Quantum numbers are defined by the last electron in configuration, for an ion Si these numbers are N = 3, L = 1, M_l = 2, M_s = -½

Filling an electronic configuration (gif):



Result: