Physical Properties Of Boron Family

PROPERTY ELEMENT
B Al Ge In Ti
Atomic number 5 13 31 49 81
Atomic mass 10.81 26.98 369.72 114.82 204.38
Atomic radius/pm 85 143 135 167 170
Ionic radius/pm(M3+) 27 53.5 62.0 80.80 88.5
First Ionisation energy kj mol-1 800 577 578 558 590
Second Ionisation energy kj mol-1 2427 1816 1979 1820 1971
Third Ionisation energy kj mol-1 3659 2744 2962 2704 2877
Electronagativity 2.0 1.5 1.6 1.7 1.8
Density (g/cm3) 2.35 2.70 5.90 7.31 11.85
Melting point (K) 2453 933 303 430 576
Boiling point 3923 2740 2676 2353 1730
Reduction potential (V) +1.66 -0.56 -0.34 +1.26
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