Question

1(b) An element that will be
placed in fourth period and
second group is:
Potassium
O Calcium
O Sulphur
O Phosphorus​

Answer 1

Answer:

Lets see -

Explanation:

Calcium

Atoms in its shells - 2 , 8 , 8 , 2

As four shells then fourth period

And At last 2 electrons so 2nd group.

Hope it helps.