Hydrogen (H)

The lightest and most abundant element in the universe.

It is the only element that can exist without neutrons.

Element properties

Atomic number
1
Symbol
H
Atomic mass
1.008 u
Category
Nonmetal
Period
1
Group
1
Block
s
State
Gas
Electron configuration
1s1
Electronegativity (Pauling)
2.2
Density
0.00008988 g/cm³
Melting point
-259.1 °C
Boiling point
-252.9 °C

Uses