Question

Three elements ABC have a atomic number of 7,8,9 what would be their position in the periodic table
Stategroup group number and period number of each

Answer 1

For A -

Grp no. -15 nd period is 2nd

For B-

Grp no.- 16 nd period 2nd

For c-

Grp no. -17 nd period 2nd

A is nitrogen

B is oxygen

C is Fluorine