Question

The electronic configurations of four elements A, B, C and D are as follows A
2, 8, 1
B
2, 8, 7
C
2, 8, 8
D
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?
(f) Which element is a noble gas?

Answer 1

Answer:

a . A

b. B

c.a and b

d. a and d

e b

f.c