Ques.20

Dear student

Period, Group and Block of the following elements:

Ca(20) : 1s²2s²2p⁶3s²3p⁶4s²
​This element has 2 electrons in valence shell, it lies in Group 2
Calcium lies in Fourth period
It is a s-block.

Co(27): [Ar]3d⁵4s²
This element lies in Group 27
It lies in Fourth period.
It is a d-block element

P(15): 1s²2s²2p⁶3s²3p³
This elements lies in Group 15
It lies in Third period.
It is a p block element.

Regards