Connecting Chemistry


Atomic symbol: O
Atomic number: 8
Atomic mass: 16.00

Appearance: colorless gas at 25°C

Group: 16
Period: 2
Series: Reactive nonmetals
Block: p
Electron configuration: 1s²2s²2p⁴

Third most abundant element in the universe, after hydrogen and helium.

Readily forms oxides with most other elements and compounds.

Fun Fact! Liquid and solid oxygen occur in a variety of colours, suc as pale blue, red, pink, orange, and black.