The electronic configurations of three elements A, B, and C are as follows:
A 2,8,1
B 2,8,7
C 2,4
(a). Which of these elements is a metal?
(b). Which of theseelements are non-metals?
(c). Which two elements will combine to form an ionic bond?
(d). Which two elements will combine to form a covalent bond?
(e). Which element will form an anion of valency 1?

Explanation

(a) A
(b) B and C
(c) A and B
(d) B and C
(e) B