Periodic Table · element

Osmium

Os · Z 76

atomic number

76

atomic mass

190.23

notation

Os

group

8: Iron

period

6

state0c

Solid

state20c

Solid

occurrence

Primordial

density

22.59

melting pt

3030

boiling pt

5012

discovered

1803

abundance

0.0015

ore grade

0.05

ore minerals

with platinum; osmiridium

mined as

By-product

extraction

The rarest stable element in commerce, recovered from platinum-group refining as the volatile tetroxide.

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From the All Periodical Elements database in Notion, last edited 2026-08-16. This page is the row, rendered by the build; nothing on it is written by hand.