1.

Which one of the following groupinga represents a collection of isoelectronic species ? [ At.nos- Cs - 55 , Br - 35 ]

Answer»

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

ANSWER :C


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