Periodic Table of Elements showing boron metalloid elements


Atomic Number5
Molar Mass10.81 gmol-1
Electron Configuration[He]2s22p1
Normal Statesolid metaloid
Density @STP2.47 g cm-3
Melting Point2075oC
Boiling Point4000oC
Stable Isotopes10B, 11B
Atomic Radius88 pm
Ionic Radius12 (3+) pm
Electronegativity (Pauling)2.04
Ionization Energy (1st)801 kJ mol-1
Ionization Energy (2nd)2427 kJ mol-1
Ionization Energy (3rd)3660 kJ mol-1
Molar Heat Capacity11.1 J K-1mol-1
Standard Molar Entropy5.9 J K-1mol-1
Enthalpy of Fusion22.2 kJ mol-1
Enthalpy of Vapourization538.9 kJ mol-1
[Back to Periodic table]

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