Question

A , B are two elements having 16th group, 2nd period and 3rd period, 13th group respectively. Find chemical formula If they react With each other

Answer 1

So first the elements that exist in 16 the group and 2nd period is oxygen and the elements that exist in 13th group and 3rd period is aluminium

REACTION ARE AS FOLLOWS

Al +O2——> AL2O3

When aluminium reacts with oxygen it form aluminium oxide

And aluminium has 3 valence electron and oxygen has 2 valence electron