Ion Sc³⁺

Symbol	Sc3+
Number	21
Atomic weight	44.9559080
Latin name	Scandium
English name	Scandium

How to build an electronic configuration by yourself? See link

Electronic configuration of of Scandium

Sc: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹ → Sc³⁺:1s²2s²2p⁶3s²3p⁶4s⁰3d⁰

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

The order of filling the shells with electrons of Scandium (Sc³⁺): 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’

Scandium has 21 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 Scandium

Atoms of Scandium in compounds have an oxidation state of 3, 2, 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 Sc³⁺ = 3

Ions of Scandium

Valence of Sc³⁺

Atoms of Scandium in compounds have valence III, II, I.

Valence of Scandium is an ability of an atom Sc 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 Sc ³⁺

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

Filling an electronic configuration (gif):



Result: