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