Ion K^- (Minus one)

Symbol	K-
Number	19
Atomic weight	39.0983000
Latin name	Kalium, Calium
English name	Potassium

How to build an electronic configuration by yourself? See link

Electronic configuration of of Potassium

K: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ → K^-:1s²2s²2p⁶3s²3p⁶4s²

Same electronic configuration has an ion of Potassium -1 and Ca, Sc⁺¹, Ti⁺², V⁺³, Mn⁺⁵, Fe⁺⁶

The order of filling the shells with electrons of Potassium (K^-): 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’

Potassium has 19 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

6 electrons on 3p-sub level

2 electrons on 4s-sub level

Oxidation state of Potassium

Atoms of Potassium in compounds have an oxidation state of 1, -1.

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 K^- = -1

Ions of Potassium

Valence of K^-

Atoms of Potassium in compounds have valence I.

Valence of Potassium is an ability of an atom K 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 K ^1-

Quantum numbers are defined by the last electron in configuration, for an ion K these numbers are N = 4, L = 0, M_l = 1, M_s = -½

Filling an electronic configuration (gif):



Result: