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The Boron (Periodic Element n°5)

BORON

( From Arabic word "buraq", borax)

SYMBOL: B

ATOMIC NUMBER: 5

MOLAR MASS (g\mol): 10,81

NORMAL STATE: solid

DENSITY (g*cm-1): 2,47

MELTING POINT (°C): 2300

BOILING POINT (°C): 3931

IONIZATION ENERGY (Kj\mol): 799, 2427, 3660

ELECTRON AFFINITY (Kj\mol): +91

ELECTRONEGATIVITY: 2,0

MAIN OXIDATION STATES: +3

ATOMIC RADIUS (pm): 83

IONIC RADIUS (pm): 23