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Question

Arrange the following elements in the decreasing order of their atomic radius: oxygen, carbon, lithium.

A
Lithium > oxygen > carbon
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B
Carbon > oxygen > lithium
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C
Oxygen > carbon > lithium
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D
Lithium > carbon > oxygen
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Solution

The correct option is D Lithium > carbon > oxygen
An atomic radius is the distance between the nucleus of the atom and its ouermost shell.
Lithium, carbon and oxygen are present in same period of a periodic table. As we move from left to right across any period, the atomic radii decreases as the effective nuclear charge increases.
So the correct order is:
Lithium > carbon > oxygen

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