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5B

Boron

Metalloid · 10.81 u · group 13, period 2

Boron · B

Identity

Atomic number5

SymbolB

CategoryMetalloid

Standard stateSolid

Group · Period · Block13 · 2 · p

Electron configuration[He]2s2 2p1

Atomic

Atomic mass10.81 u

Atomic radius192 pm

Protons / Neutrons / Electrons5 / 6 / 5

Shells (e⁻ per shell)2, 3

Chemical

Electronegativity (Pauling)2.04

Ionization energy8.298 eV

Electron affinity0.277 eV

Oxidation states+3

Physical

Melting point2.35e+3 K · 2.07e+3 °C

Boiling point4.27e+3 K · 4.00e+3 °C

Density2.37 g/cm³

History

Year discovered1808

CPK color

#FFB5B5

State at room temp (25 °C)

solid

Position

Molecules with B

7 in library

Boron trifluoride

Boron Trichloride

Boron oxide (B₂O₃)

B₂O₃

Sodium borohydride

H₆B₂

H₆B₃N₃

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