1.

Consider the following elements :Ca, Cl, Na, I, Li, Ba, Sr, K, BrSeparate these elements into three groups (families) of similar properties. State one property in each case on the basis of which you have made your choice.

Answer»

Li,Na,K : All these elements ar e metals having a valency of 1.

Ca,Sr,Ba: All these elements are metals having a valency of 2.

Cl,Br,I : All these elements are halogens.



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