Question

The atomic numbers of four elements A, B, C and D are 6, 8, 10 and 12 respectively. The two elements which can react to form ionic bonds (or ionic compound) are:
(a) A and D
(b) B and C
(c) A and C
(d) B and C

Answer 1

(d) B and D

Element B has the electronic configuration of 2,6. It requires 2 electrons to complete its octet. On the other hand, element D has the electronic configuration of 2,8,2. It requires to release 2 electrons to complete its octet. Thus, both atoms react to form ionic bonds by transfer of electrons.