1. Tardigrade
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  3. Chemistry
  4. Which of the following ions is smallest in size?

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Q. Which of the following ions is smallest in size?

Classification of Elements and Periodicity in Properties

Solution:

For isoelectronic species $\left( Mg ^{2+}\right.$ and $\left. Na ^{+}\right)$ size decrease with increase of nuclear charge. Thus $Mg ^{2+}$ is smallest in size.