Evaluate Yourself
5. A student reported the ionic radii of
isoelectronic species X3+, Y2+ and Z as
136 pm, 64 pm and 49 pm respectively.
Is that order correct? Comment.
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NO, the given order is not correct.
- Isoelectronic species contain the same no of electrons in them.
- However, their atomic radii vary due to the nuclear charge.
- The cation X³⁺ with a greater positive charge will have the smallest radius due to more attraction towards the nucleus as a result of more nuclear charge.
- The cation Y²⁺ with a lesser positive charge will have a larger radius than X³⁺ due to less attraction towards the nucleus as a result of less nuclear charge.
- The neutral atom Z with no charge will have the largest radius due to lesser attraction towards the nucleus as a result of the lowest nuclear charge.
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