Holmium

LANTHANOID · GROUP None · PERIOD 6

Holmium

164.93

Atomic Data

[Xe] 4f¹¹ 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	11	57
O	5	5s	2	59
O	5	5p	6	65
P	6	6s	2	67
Total			67	67

Holmium is monoisotopic — ¹⁶⁵Ho is its only naturally occurring stable isotope, accounting for 100% of all natural Holmium.

Isotope	Symbol	Protons	Neutrons	Abundance	Stability
Holmium-165	¹⁶⁵Ho	67	98	100	Stable

Holmium is present in Earth's crust at approximately 1.3 ppm by mass and at approximately 0.05 ppm by mass throughout the universe.

Holmium

1.3 ppm

Silicon (ref.)

277,000 ppm

Oxygen (ref.)

461,000 ppm

Holmium

0.05 ppm

Helium (ref.)

230,000 ppm

Hydrogen (ref.)

739,000 ppm

Free periodic table reference sheets for classrooms, study sessions, and laboratory use.

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