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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 D


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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