O

Oxygen

Atomic Number 8 · Gas ampule

The most abundant element in Earth's crust. Essential for respiration in most living organisms.

Atomic Mass

15.999 u

Category

Reactive Nonmetal

Phase (STP)

Gas

Density

0.001429 g/cm³

Melting Point

-218.79 °C

Boiling Point

-182.96 °C

Electronegativity

3.44 (Pauling)

Atomic Radius

60 pm

Electron Configuration

[He] 2s2 2p4

Discovered

1774 — Joseph Priestley

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Sample form: Gas ampule

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