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Two ions are said to be isoelectronic with each other if they have the same number of valence electrons and the same structure, regardless of the nature of elements involved.

some examples are:

cations like K+, Ca2+,Sc3+

CO, N2,

valence electrons of C- 4, valence electrons of O -6, total num-10

valence electron of N -5 , THEREFORE TOTAL ELECTRONS-5+5=10

.Hence isoelectronic

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