. From the following elements

From the following elements:


4Be; 9F; 19K; 20Ca


(i) Select  the  element having one  electron in the .outermost shell.


(ii)  two elements of the same  group.


Write  the formula of and  mention the  nature of the compound formed by the  union of 19K and  element X(2,8,7)

Best Answer

(i)  19K


(ii) 4Be, 20Ca belong  to the same  group.


Electronic configuration of K (19) = 2, 8, 8, 1 Valency of K = 1


Electronic configuration of X (2, 8, 7) Valency of X = 1


two elements of the same  group


The 'formula  of the compound formed  is KX. The compound KX is o ionic nature. The bond  is formed  by transference of electrons

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