1
1.008 u
H
Hydrogen
Nonmetal
Atomic Structure
Physical State
Group
1
Period
1
Block
s
Electron Configuration
1s¹
Physical Properties
Atomic Mass:
1.008 u
Electronegativity:
2.2
Atomic Radius:
120 pm
Ionization Energy:
13.598 eV
Density:
0.00008988 g/cm³
Melting Point:
14.01 K
Boiling Point:
20.28 K
Historical Information
Discovered By:
Henry Cavendish
Year Discovered:
1766