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Question

Scientists believe that about 75% of the universe consists of dark matter and dark energy, but roughly 75% of the ordinary matter consists of this element, with helium making up nearly 25%, and all of the other elements adding up to less than 1%. Name this element.

A
Carbon
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B
Nitrogen
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C
Oxygen
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D
Hydrogen
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Solution

The correct option is D Hydrogen
Hydrogen lightest of all the element (after helium) as it contains only 1 proton and 1 neutron, which was among the first elements to be formed in the formation of early universe. And because it is a positive and lightest of all elements (after helium) containing 1 proton and 1 neutron and was the first to be formed in the universe during its creation. Helium, lithium and hydrogen were the first elements formed but hydrogen constitutes 95% of the universe. Lithium and helium are noble gases and are non reactive.


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