Question

# Which of the following ion is smallest in size?

A

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B

Na+

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C

O2-

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D

F-

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Solution

## The correct option is A Let us look at the number of electrons and protons in each of the given ions: Mg2+ ⇒ Atomic Number=12; Protons=12; Electrons=10 Na+ ⇒ Atomic Number=11; Protons=11; Electrons=10 O2− ⇒ Atomic Number=8; Protons=8; Electrons=10 F− ⇒ Atomic Number=9; Protons=9; Electrons=10 Protons have positive charge and electrons have an equal but negative charge. The more postive the charge, the smaller the ionic radius if number of electrons is same. So Mg2+ is smallest in size.

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