Question

The atoms A and B have electronic configuration (2, 8, 3) and (2, 7) respectively. 2M
i) To which periods, do A and B belong?
ii) To which groups, do A and B belong

Answer 1

Answer:

A belongs to period 3 and B belongs to period 2

A belongs to gruop 3 and B belongs to group 7

Explanation:

A is Aluminium and B is flourine