Question

write electronic configuration of following element and find out their period and group number
a) chlorine
b) sodium
c)iron​

Answer 1

Answer:

(a) electronic configuration of chlorine=(Ne) 3s^2-3p^5

group no.is 17 and period no.is 3

(b) electronic configuration of sodium=(Ne) 3s^1

group no.1 and period no.3

(c) electronic configuration of iron=(Ar) 3d6 4s2

group no.8 and period no.4