Question

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 these elements 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 ?

Lakhmir Singh Chemistry Class 10

Answer 1

a)A b)B C c) AB d)BC e)B