1.

Which of the following groupings represents collection of isoelectronic species? (At. No. : Cs = 55, Br = 35)

Answer»

`Na^(+), Ca^(2+), Mg^(+)`
`N^(3-) , F^(-) , Na^(+)`
`Be, Al^(3+), Cl^(-)`
`Ca^(2+), CS^(+), Br`

SOLUTION :`{:(N,(7),N^(3-),(10),""N^(3)","F^(-)" and " Na^(+)),(F,(9),F^(-),(10),"are isoelectronic"),(Na,(11),Na^(+),(10),):}`


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