. 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).

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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