Answer:
2 protons and 2 neutrons fuse to make 1 helium nucleus
Explanation:
In the stars, such as the Sun, the principle element presented is the hydrogen. At high pressure and temperatures, two hydrogens nuclei react between then and form a helium nucleus. In a hydrogen atom, there are 1 proton and 1 neutron. So, to protons and two neutrons fuse to form 1 helium nucleus.
