The lightest element in the world is?

Oxygen

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Helium

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Hydrogen

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Chlorine

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Solution

The correct option is C Hydrogen
Answer:- (C) Hydrogen
Explanation:-
Hydrogen is the simplest and lightest element and the most common in the entire universe.
Since hydrogen atom has only 1 electron and 1 proton, total mass of hydrogen is smallest. Thus, hydrogen is the lightest element.

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