1.

A student reported the ionic radii of iso electronic species X3+ , Y2+ and Z- as 136 pm, 64 pm and 49 pm respectively. Is that order correct? Comment

Answer»

X3+, Y2+ , Z- are iso electronic. 

∴ Effective nuclear charge is in the order 

(Zeff)Cl- < (Zeff)YY2+ < (Zeff)X3+ and hcnce, ionic radii should be in the order rZ- > rY2+ > rX3+ 

∴ The correct values are:

SpeciesIonic raddi
Z-136
Y2+64
X3+49


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