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Asked by Suri Last Modified
Answer 
Navneet Jhariya
(a) Nuclear Charge (Z)
Because although all three elements have same number of electrons but inside nucleus the number of protons in unequal.In case of F- it is having only 9 proton and 10 electron so size will expand liitle.In case of Ne it has 10 proton and 10 electron but will have size smaller than F-.In case of Na+ it will have 11 proton and 10 electron, it means nucleus is more positive than available electrons in orbitals and hence there will be shrinking of size of Na+.
F-> Ne > Na+ Size order for these isoelectronic species.
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