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Question
The size of isoelectronic species — F-, Ne and Na+ is affected by ______.
Options
Nuclear charge (Z)
Valence principal quantum number (n)
Electron-electron interaction in the outer orbitals
None of the factors because their size is the same.
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Solution
Nuclear charge (Z)
Explanation:
The size of an isoelectronic species increases with a decrease in the nuclear charge (Z). For example, the order of the increasing nuclear charge of F–, Ne, and Na+ is as follows:
F– < Ne < Na+
Z 9 10 11
Therefore, the order of the increasing size of F–, Ne and Na+ is as follows:-
Na+ < Ne < F–
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