The increasing order of the ionic radii of the given isoelectronic species is :
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Size of isoelectronic species -
Smaller the value of z/e, larger the size of that species.Smaller z means effective nuclear charge is small hence size is large.
For isoelectronic species as effective nuclear charge increases, ionic radii decreases. Nuclear charge is maximum of the species with maximum protons. Order of nuclear charge:
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