Osmium

TRANSITION METAL · GROUP 8 · PERIOD 6

Osmium

190.23

Atomic Data

[Xe] 4f¹⁴ 5d⁶ 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	14	60
O	5	5s	2	62
O	5	5p	6	68
O	5	5d	6	74
P	6	6s	2	76
Total			76	76

Osmium has seven naturally occurring stable isotopes. The most abundant is ¹⁹²Os, comprising 40.78% of all naturally occurring Osmium.

Isotope	Symbol	Protons	Neutrons	Abundance	Stability
Osmium-184	¹⁸⁴Os	76	108	0.02	Stable
Osmium-186	¹⁸⁶Os	76	110	1.59	Stable
Osmium-187	¹⁸⁷Os	76	111	1.96	Stable
Osmium-188	¹⁸⁸Os	76	112	13.24	Stable
Osmium-189	¹⁸⁹Os	76	113	16.15	Stable
Osmium-190	¹⁹⁰Os	76	114	26.26	Stable
Osmium-192	¹⁹²Os	76	116	40.78	Stable

Osmium is present in Earth's crust at approximately 0.0018 ppm by mass and at approximately 0.3 ppm by mass throughout the universe.

Osmium

0.0018 ppm

Silicon (ref.)

277,000 ppm

Oxygen (ref.)

461,000 ppm

Osmium

0.3 ppm

Helium (ref.)

230,000 ppm

Hydrogen (ref.)

739,000 ppm

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