Question

What is the atomic mass of Hydrogen... What happens to its atomic mass when 2 Hydrogen atom are considered?

Answer 1

Atomic mass of Hydrogen is 1 amu
It doesn't change when 2 Hydrogen bond together.
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Answer 2

The Atomic mass number of Hydrogen is $\bold{1}$
As the two atoms of Hydrogen approach each other, the electron of each atom begins to feel the attraction of both nuclei. ...As a result, then, each of the hydrogen atoms in this H2 molecule now has a share of two electrons