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Although He is the second most abundant element in the universe, it is very rare on the earth. Why?
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In this case, the element is helium. Show more…
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Although He is the second most abundant element in the universe, it is very rare on earth. Why?
Hydrogen is by far the most abundant element cosmically. In interstellar space, it exists mainly as $\mathrm{H}_{2} .$ In contrast, on Earth, it exists very rarely as $\mathrm{H}_{2}$ and is ninth in abundance in the crust. Why is hydrogen so abundant in the universe? Why is hydrogen so rare as a diatomic gas in Earth's atmosphere?
What is the most abundant element in the known universe?
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