1.

Which one of the following sets of ions represents a collection of iso-electronic species ?

Answer»

`k^+, Cl^- , MG^(2+) , Sc^(3+)`
`Na^+, Ca^(2+), Sc^(3+) , F^-`
`K^+ , Ca^(2+),Sc^(3+) , CL^-`
`Na^+ , Mg^(2+) , Al^(3+) , Cl^-`

Answer :C


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