. Two elements Mand N belong to group I and II respectively and are in the same period of the
periodic table. How do the following properties of Mand N vary:
a) sizes of their atoms?
(b) their metallic characters?
(c) their valencies in forming oxides? (d) formulae of their chlorides?
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(a) Size of atom of elements decreases from left to right in a period hence atom of element M is bigger than atom of element N.
(b) M is more metallic than N since metallic character decreases as we go along a period.
(c) Group I: Valency 1
Group II: Valency 2
(d) Formulae of chloride : MCl, NCl2
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