Identify the species having larger radius from the following pairs: i. Na and Na^+ ii. Na^+ and Mg^2+

Monjur Alahi

Identify the species having larger radius from the following pairs:

i. Na and Na+

ii. Na+ and Mg2+


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Salim Ahmed Kawsar

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i. The nuclear charge is the same in Na and Na+. But Na+ has a smaller number of electrons and a smaller number of occupied shells (two shells in Na+, while three shells in Na). 

Therefore, radius of Na is larger.

ii. Na+ and Mg2+ are isoelectronic species.

Mg2+ has a larger nuclear charge than that of Na+.

Therefore, Na+ has larger radius.

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