Hydrogen is by far the most abundant element cosmically. In interstellar space, it

Chapter 22, Problem 22.1

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Hydrogen is by far the most abundant element cosmically. In interstellar space, it exists mainly as H2. In contrast, on Earth, it exists very rarely as H2 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 Earths atmosphere?

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