Erbium

LANTHANOID · GROUP None · PERIOD 6

Erbium

167.26

Atomic Data

[Xe] 4f¹² 6s²

Shell	n	Subshell	Electrons	Cumulative
K	1	1s	2	2
L	2	2s	2	4
L	2	2p	6	10
M	3	3s	2	12
M	3	3p	6	18
M	3	3d	10	28
N	4	4s	2	30
N	4	4p	6	36
N	4	4d	10	46
N	4	4f	12	58
O	5	5s	2	60
O	5	5p	6	66
P	6	6s	2	68
Total			68	68

Erbium has six naturally occurring stable isotopes. The most abundant is ¹⁶⁶Er, comprising 33.61% of all naturally occurring Erbium.

Isotope	Symbol	Protons	Neutrons	Abundance	Stability
Erbium-162	¹⁶²Er	68	94	0.14	Stable
Erbium-164	¹⁶⁴Er	68	96	1.61	Stable
Erbium-166	¹⁶⁶Er	68	98	33.61	Stable
Erbium-167	¹⁶⁷Er	68	99	22.93	Stable
Erbium-168	¹⁶⁸Er	68	100	26.78	Stable
Erbium-170	¹⁷⁰Er	68	102	14.93	Stable

Erbium is present in Earth's crust at approximately 3.5 ppm by mass and at approximately 0.1 ppm by mass throughout the universe.

Erbium

3.5 ppm

Silicon (ref.)

277,000 ppm

Oxygen (ref.)

461,000 ppm

Erbium

0.1 ppm

Helium (ref.)

230,000 ppm

Hydrogen (ref.)

739,000 ppm

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