In the course of the star's existence, the internal reaction that turns hydrogen atoms into helium eventually comes to an end. When the reaction comes to an end.
A star begins to collapse inward even if gravity is trying to expand it. The star initially transforms into a supergiant and then into a red giant as it enlarges. Atomic number 1 and the letter H stand for the chemical element hydrogen. The element hydrogen is the lightest. Hydrogen is a gas made up of diatomic molecules with the formula H2 under normal circumstances.
Chemical element helium has the symbol He and atomic number 2. The first member of the noble gas group in the periodic table, helium is a colorless, odorless, tasteless, inert, monatomic gas that is not harmful.
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