Consider the following species : {N}³-}, ...

NCERT Class XI Chemistry Classification of Elements and Periodicity in Properties Solutions

Question : 12 of 40

Marks: +1, -0

Consider the following species :

\mathrm{N}^{3-}, \mathrm{O}^{2-}, \mathrm{F}^{-}, \mathrm{Na}^{+}, \mathrm{Mg}^{2+}

and

\mathrm{Al}^{3+}

(a) What is common in them?

(b) Arrange them in the order of increasing ionic radii.

Solution:

(a) All these are isoelectronic species as they are having same number of electrons i.e., 10.

(b) As Z/e decreases, size increases so, order should be,

\mathrm{N}^{3-}

\mathrm{O}^{2-}

\mathrm{F}^{-}

\mathrm{Na}^{+}

\mathrm{Mg}^{2+}

\mathrm{Al}^{3+}

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