Erbium Er
Erbium is the 68 element in periodic table situated in 8 period.| Symbol | Er |
| Number | 68 |
| Atomic weight | 167.2590000 |
| Latin name | Erbium |
| English name | Erbium |
Electronic configuration of of Erbium
Er: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f12
Short notation:
Er: [Xe]6s2 4f12
Same electronic configuration has an atom of Erbium and Yb+2, Lu+3, Hf+4, Ta+5, W+6, Re+7, Os+8
The order of filling the shells with electrons of Erbium (Er): 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’
Erbium has 68 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
10 electrons on 3d-sub level
6 electrons on 4p-sub level
2 electrons on 5s-sub level
10 electrons on 4d-sub level
6 electrons on 5p-sub level
2 electrons on 6s-sub level
12 electrons on 4f-sub level
Oxidation state of Erbium
Atoms of Erbium in compounds have an oxidation state of 3.
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 Erbium
Valence of Er
Atoms of Erbium in compounds have valence III.
Valence of Erbium is an ability of an atom Er 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 Er
Quantum numbers are defined by the last electron in configuration, for an atom Er these numbers are N = 4, L = 3, Ml = 1, Ms = -½
Filling an electronic configuration (gif):
Result:
Ionization energy
The closer the electron is to the center of the atom, the more energy is needed to tear it off. The energy spent on removing an electron from an atom is called ionization energy and is designated Eo. Unless otherwise stated, the ionization energy is the energy of removal of the first electron, and there are also ionization energies for each subsequent electron.
Ionization energy of Er:
Eo = 589 kJ/mol
See all elements of the periodic table
Where is Er in the periodic table?
