Boron

Metalloids · Group 13 · Period 2

Atomic properties

Atomic number	5
Symbol	B
Standard atomic weight	10.81
Classification	Metalloids
Group	13
Period	2
Block	p-block
Electron configuration	[He] 2s2 2p1
Electronegativity (Pauling)	2.04
Common oxidation states	+3

Physical properties

Phase at 20 °C	Solid
Density	2.34 g/cm³
Melting point	2076 °C
Boiling point	3927 °C
Discovered	1808
CAS number	—

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