Question

Why is hydrogen called the most abundant element in universe?

Answer 1

It is the third most abundant element on the Earth's surface after oxygen and silicon. At this stage of our Sun's lifecycle, hydrogen atoms are fused to form helium atoms. This nuclear reaction produces very large amounts of energy.

Answer 2

Answer:

Hydrogen — with just one proton and one electron (it's the only element without a neutron) — is the simplest element in the universe, which explains why it's also the most abundant.