Physical Property Of Carbon Family

PROPERTY ELEMENT
C Si Ge Sn Pb
Atomic number 6 14 32 50 82
Atomic mass 12.01 28.09 72.60 118.71 207.2
Covalent radius/pm 77 118 122 140 146
Ionic radius / pm (M4+) 40 53 69 78
Ionic radius / pm (M2+) 73 118 119
First Ionisation energy kj mol-1 1086 786 761 708 715
Second ionization energy kj mol-1 2352 1577 1537 1411 1450
Third ionization energy kj mol-1 4620 3228 3300 2942 3081
Fourth Ionization energy kj mol-1 6220 4354 4409 3929 4082
Electronegativity 2.5 1.8 1.8 1.8 1.9
Density 3.51 2.34 5.32 7.26 11.34
Melting  point(K) 4373 1693 1218 505 600
Boiling point (K) 3550 3123 2896 2024
Electric Resistivity (ohm/cm) 1014-1016 50 50 10-5 2×10-3
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