Osmium
A very hard, gray, toxic, and nearly infusible metal element, atomic number 76, atomic weight 190.2, symbol Os.
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Subheadings:
Tree Number(s): D01.268.556.660, D01.268.956.702, D01.552.544.660
MeSH Unique ID: D009992
Registry Number: 2E7M255OPY