Question

An element has atomic number 18. To which group, period does it belong ? It is metal or non-metal ?
a) 7th group, 2nd period, Non-metal
b) 18th group, 3rd period, Non-metal
c) 7th group, 3rd period, Metal
d) 17th group, 3rd period, Metal

Answer 1

Explanation:

Electronic configuration Of element P

K L M N

2 ,8, 8 ,1

Valency of P is 1

As element P has 4 shells so it belongs to 4 period &

Its valency is (1) so it belongs to first group

Answer 2

Answer:

b) 18th group, 3rd period, non metal