Amongthe elementsCa, Mg , P and C1 theorderof increasingatomicradiiis

1.	Amongthe elementsCa, Mg , P and C1 theorderof increasingatomicradiiis
Answer» `Mglt Calt C1lt P ` `C1 LT P lt Mg lt Ca` `P lt C1lt Calt Mg` `Ca lt Mg lt P lt C1` Solution :Arrange the elements : Ca, Mg, P andC1 indifferentgroupsand periods in increasingorderfo theiratomicnumberswe have, `{:("GROUP " to,,12,,15,,17),("Period " 2,,Mg,,P,,C1),("Period " 3 ,,Ca,,-,,-):}` (i) Sinceatomicradiiincreasefrom top tobottomin a groupthereforeatomicradiusof Ca ismorethan thatof Mg i.e.,`Mg lt Ca` (ii) Sinceatomicradiidecreases alonga periodfromC1decrease in the order: `Mg gt P gt C1` or increase in THEORDER`: C1 lt P lt Mg` Combiningthese two trends the atomicradii of`Ca, Mg, P ` andC1 increase inthe order : `C1 lt P lt Mg lt Ca` i.e.,option ( b)is correct.

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