Question

In which period and group would you place the elements with the following electronic configurations.
(i) 2,8 (ii) 2,5

Answer 1

Ans:

you can find it easily by the following steps

Explanation:

1)2,8

there are 2 shells so period is 2

there are 8 atoms in last shell so we should add +10

it will become 18, so group is 18

2)similarly,

15 group

2 period

Answer 2

Explanation:

I) 2,8 configuration belongs to neon and it must be placed in

2 period and 18 group ( noble gas)

ii) 2,5 configuration belongs to nitrogen and it must be placed in

2 period and 15 group.

Hope it helps you