Two elements M and N belong to group I and II respectively and are in the same period of the periodic table. How do the following properties of M and N vary:
(a) sizes of their atoms ?
(b) their metallic characters?
© their valencies in forming oxides?
(d) formulae of their chlorides?
(a) Size of atom decreases from left to right. Atom of M is bigger than atom of N,
(b) M is more metallic than N.
© Group I: valency 1
Group II: valency 2’ .
(d)Formulae of chloride: MCI, N$C{{l}_{2}}$