Some neutrons combine with other neutrons to make more stable configurations. Other neutrons decay into protons. Electrons are not bound because of high energy.
75% hydrogen, 25% helium 87% protons, 13% neutrons
Some neutrons combine with other neutrons to make more stable configurations. Other neutrons decay into protons. Electrons are not bound because of high energy.
75% hydrogen, 25% helium 87% protons, 13% neutrons