1.

Eu^(3+) ion is isoelectronic with

Answer»

`Ce ^(4+)`
`Yb ^(2+)`
`Eu ^(4+)`
`Sm^(2+)`

SOLUTION :We know that, the species which CONTAINS same number of VALENCE electrons are isoelectronic. `Eu^(3+) and Sm^(2+)` have same configuration`6s^(0), 4f^(6), 5d^(0).` HENCE these are isoelectronic.


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