When hydrogen nuclei fuse, four hydrogen nuclei become

Question

A a helium nucleus, releasing energy.

B a helium nucleus, absorbing energy.

C a proton, releasing energy.

D a proton, absorbing energy.

Answer 1

Your answer is: A) a helium nucleus, releasing energy.

"Hydrogen burning is the fusion of four hydrogen nuclei (protons) into a single helium nucleus (two protons and neutrons.) The process is a series of reactions. The type of reactions depend on the mass of a star and its core temperature and density. In our Sun, the process is a proton-proton chain. In more massive stars, the C-N-O cycle (Carbon-Nitrogen-Oxygen) serves to fuse hydrogen into helium."

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http://ie.lbl.gov/education/glossary/glo...