Question

A part of modern periodic table is given below. On its basis, answer the following questions:

Group No. →	1	2	13	14	15	16	17	18
Period ↓
2		A				B
3	E			D			F	C

Write the molecular formula of the compound formed by the combination:

A and F

Answer 1

Element A belongs to group 2 of the periodic table, hence it shows a valency of 2.

Element F belongs to group 17 of the periodic table and shows a valency of 1.

So the formula of the compound formed will be AF₂.