. 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

Ans. (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


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