Overlay:
Study57–71La–Lu
89–103Ac–Lr
Lanthanides
Actinides
Atomic #1 • Period 1 • Group 1
Hydrogen
1H
Reactive NonmetalsGass-block
Key Principle & Summary
The lightest and most abundant element in the universe, powering stellar nuclear fusion and constituting water.
Atomic Mass
1.008 u
Electron Config
1s¹
Electronegativity
2.2
Density
0.08988 g/cm³
Melting Point
14.01 K
Boiling Point
20.28 K
By: Henry Cavendish1766