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Last updated by Mattia Cola - Τρί, 26/02/2013 - 19:29

HELIUM

(from Greek "Helios", the Sun)

SYMBOL: He

ATOMIC NUMBER: 2

MOLAR MASS (g\mol): 4,00

NORMAL STATE: gaseous

DENSITY (g*cm-3): 0,12

MELTING POINT (°C): -

BOILING POINT (°C): -269

IONIZATION ENERGY (kj\mol): 2370; 5250

ELECTRON AFFINITY (Kj\mol): <0

ELECTRONEGATIVITY: -

MAIN OXIDATION NUMBERS: 0

ATOMIC RADIUS (pm): 128

IONIC RADIUS (pm): -