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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