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  4. The most abundant element in the universe is thought to be

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Q. The most abundant element in the universe is thought to be

UPSEEUPSEE 2009

Solution:

Hydrogen forms about $75 \%$ of the mass (total amount) of the universe. It has been estimated that more than $90 \%$ of all atoms in the universe are $H$ atoms. While most of the remaining atoms are of $He$.

The order of abundance of given elements in the universe is

$H > O > C > N$