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Q. Isoelectronic for $ {{K}^{+}} $ is

Rajasthan PETRajasthan PET 2001

Solution:

Those species (element, atom or ions) which have same number of electrons are called isoelectronic.
Example $-K^{+}$and Ar
Number of electrons in $K^{+}=19-1=18 e^{-}$
Number of electrons in $Ar =18 e ^{-}$