Periodic Table
5
B
10.81
Boron
MetalloidMetalloid; electron-deficient; forms electron-deficient hydrides (boranes).
Electronic Configuration
1s² 2s² 2p¹or1s² 2s² 2p¹
Electron shells
2e⁻n=1
3e⁻n=2
Properties
Atomic number
5
Atomic mass
10.81 u
Category
Metalloid
Block / Group / Period
p · 13 · 2
Valence electrons
3
Oxidation states
+3
Electronegativity
2.04
Atomic radius
87 pm
Ionization energy
801 kJ/mol
Electron affinity
27 kJ/mol
Melting point
2349 K / 2076 °C
Boiling point
4200 K / 3927 °C
Density
2.34 g/cm³
State at 25 °C
solid
Personal Notes
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