Boron Family – Introduction
Group 13 of long form of periodic table (previously reported as group III A according to Mendeleefs periodic table) includes boron (B) ; aluminium (Al) , gallium (Ga), indium (In) and thallium (Tl) Boron is the first member of group 13 of the periodic table and is the only non-metal of this group. The all other members are metals. The non-metallic nature of boron is due its small size and high ionisation energy. The members of this family are collectively known as boron family and sometimes as aluminium family.
Electronic configuration
| Element | Electronic configuration (ns2 np1) |
| 5B | 1s2, 2s22p1 or [He] 2s2 2p1 |
| 13Al | 1s2, 2s2 2p6, 3s2 3p1 or [Ne] 3s2 3p1 |
| 31Ga | 1s2, 2s2 2p6, 3s2 3p6 3d10, 4s2 4p1 or [Ar] 3d10 4s2 4p1 |
| 49In | 1s2, 2s2 2p6, 3s2 3p6 3d10, 4s2 4p6 4d10, 5s25p1 or [Kr] 4d10 5s2 5p1 |
| 81Tl | 1s2, 2s2 2p6, 3s2 3p6 3d10, 4s2 4p6 4d10 4f14, 5s2 5p6 5d10 6s2 6p1 or [Xe] 4f14 5d10 6s2 6p1 |
