Periodic Table of Elements showing barium alkaline earth metal elements


Atomic Number56
Molar Mass137.34 gmol-1
Electron Configuration[Xe]6s2
Normal Statesolid metal
Density @STP3.59 g cm-3
Melting Point727oC
Boiling Point1897oC
Stable Isotopes130Ba, 132Ba, 134Ba, 135Ba, 136Ba, 137Ba, 138Ba
Atomic Radius224 pm
Ionic Radius136 (2+) pm
Electronegativity (Pauling)0.89
Ionization Energy (1st)503 kJ mol-1
Ionization Energy (2nd)965 kJ mol-1
Ionization Energy (3rd)3600 kJ mol-1
Molar Heat Capacity28.1 J K-1mol-1
Standard Molar Entropy62.5 J K-1mol-1
Enthalpy of Fusion7.66 kJ mol-1
Enthalpy of Vapourization150.9 kJ mol-1
[Back to Periodic table]

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