Which of thefollowingsets ofionsrepresentsa collectionof isoelectronic

1.	Which of thefollowingsets ofionsrepresentsa collectionof isoelectronicspecies ?
Answer» `K^(+) ,C1^(-) ,Mg^(2+) , SC^(3+)` `NA^(+) , Ca^(2+) , Sc^(3+) , F^(-)` `K^(+) , Ca^(2+) , Sc^(3+) , C1^(-)` `Na^(+) , Mg^(2+) ,A1^(3+) ,C1^(-)` Solution :`K^(+)(19 - 1= 18 ) . C1^(-)(17+ 1= 18) .` `Ca^(2+)(20- 2 =18) , Sc^(3+)(21 = 3=18)` represent acollectionof ISOELECTRONIC species.

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