Ion Co- (Minus one)
| Symbol | Co- |
| Number | 27 |
| Atomic weight | 58.9331940 |
| Latin name | Cobaltum |
| English name | Cobalt |
Electronic configuration of of Cobalt
Co: 1s2 2s2 2p6 3s2 3p6 4s2 3d7 → Co-:1s22s22p63s23p64s23d8
Same electronic configuration has an ion of Cobalt -1 and Mn-3, Fe-2, Ni, Zn+2, Ga+3, Ge+4, As+5, Se+6, Br+7
The order of filling the shells with electrons of Cobalt (Co-): 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’
Cobalt has 27 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
8 electrons on 3d-sub level
Oxidation state of Cobalt
Atoms of Cobalt in compounds have an oxidation state of 5, 4, 3, 2, 1, 0, -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 Co- = -1
Ions of Cobalt
Valence of Co-
Atoms of Cobalt in compounds have valence V, IV, III, II, I.
Valence of Cobalt is an ability of an atom Co 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 Co 1-
Quantum numbers are defined by the last electron in configuration, for an ion Co these numbers are N = 3, L = 2, Ml = 0, Ms = -½
Filling an electronic configuration (gif):
Result:
See all elements of the periodic table
Where is Co in the periodic table?
