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(i) Two atoms X and Y have electronic co...

(i) Two atoms X and Y have electronic configuration `[He]2s^(2)2p^(3) and [Ne]3s^(2)3p^(2)` respectively. Which period and group of periodic table do they belong to?
(ii) Second electron affinity of an element is always endotheric. Explain.

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(i) `X to` period 2, group-15, Y`to`period 3, group 14.
(ii) N/A
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