Argon Ar

Argon is the 18 element in periodic table situated in 3 period.

Symbol	Ar
Number	18
Atomic weight	39.9480000
Latin name	Argon
English name	Argon

How to build an electronic configuration by yourself? See link

Electronic configuration of of Argon

Ar: 1s² 2s² 2p⁶ 3s² 3p⁶

Short notation:
Ar: [Ar]

Same electronic configuration has an atom of Argon and Si^-4, P^-3, S^-2, Cl^-1, K⁺¹, Ca⁺², Sc⁺³, Ti⁺⁴, V⁺⁵, Mn⁺⁷

The order of filling the shells with electrons of Argon (Ar): 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’

Argon has 18 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

Oxidation state of Argon

Atoms of Argon in compounds have an oxidation state of 0.

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.

Ions of Argon

Valence of Ar

Atoms of Argon in compounds have valence .

Valence of Argon is an ability of an atom Ar 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 Ar

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

Filling an electronic configuration (gif):



Result: