Question

Name the non metallic element present in the third period which forms allotropes other than sulphur and chlorine
a)Flourine
b) Phosphorus
c) Oxygen
d) nitrogen.​

Answer 1

Answer:

option (b)

Explanation:

the non metallic element present in the third period which forms allotropes other than Sulphur and chlorine is  Phosphorus

Answer 2

b) phosphorus

I am not sure but I think that it is option b