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For the universe in which the earth exists, hydrogen accounts for 75% and helium for 23%. All the remaining elements , together, account for 2%. So there is no element which accounts for 20%.


Furthermore, helium is very rare on earth - it accounts for approx 8 parts per billion or 0.0000008%.



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8y ago
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5mo ago

Hydrogen is the most abundant element in the universe and makes up about 75% of its elemental mass. Helium is the next most abundant element, making up about 25% of the universe's elemental mass. Other elements, including oxygen, carbon, and iron, make up a very small percentage of the universe's elemental composition.

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Q: Which element makes up 20 percent of earths universe?
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