Question

why is hydrogen not found in our atmosphere​

Answer 1

There is hydrogen in the air in the form of H2. There are no hydrogen atoms in the air because hydrogen is highly reactive as a sole atom and requires another hydrogen atom to stabilise itself. Furthermore hydrogen is of low frequency in the Earth’s atmosphere because the H2 has very low molecular weight and therefore escapes the Earth’s gravity- rising into space.

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Answer 2

due to its very lower density it goes up in atmosphere and at last out of atmosphere...