5
10.81 u
B
Boron
Metalloid
Atomic Structure
Physical State
Group
13
Period
2
Block
p
Electron Configuration
[He] 2s² 2p¹
Physical Properties
Atomic Mass:
10.81 u
Electronegativity:
2.04
Atomic Radius:
192 pm
Ionization Energy:
8.298 eV
Density:
2.34 g/cm³
Melting Point:
2349 K
Boiling Point:
4200 K
Historical Information
Discovered By:
Joseph Louis Gay-Lussac
Year Discovered:
1808