Physical Properties Of Nitrogen Family

PROPERTY  ELEMENT 
N P As Sb Bi
Atomic number 7 15 33 51 83
Atomic mass 14.01 30.97 74.92 121.75 208.98
Covalent radius /pm 70 110 120 140 150
Ionic radius / pm 171N3- 212P3- 222As3+ 76Sb3+ 103Bi3+
First ionisation energy kj mol-1 1402 1012 947 834 703
Second ionisation energy kj mol-1 2856 1903 1798 1595 1690
Third ionization energy kj mol-1 4577 2910 2736 2443 2466
electronegativity 3.0 2.1 2.0 1.9 1.9
Density (g/cm3) 0.879 1.832 5.778 6.697 9.808
Melting point (K) 63 317.1 1089 903.7 544.4
Boiling point 77.2 553.5 888 1860 1837
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