The elements B, Al, Ca, In and Tl are placed in the same group of the periodic table. Give reason.

The elements B, Al, Ca, In and Tl are placed in the same group of the

1.	The elements B, Al, Ca, In and Tl are placed in the same group of the periodic table. Give reason.
Answer» The elements B, Al, Ca, In and Tl are placed in the same group of the periodic table because each one has the same number of elections (ns²np¹) in its valance shell.