In medium-sized stars such as the Sun, nuclear fusion almost always means the fusing______(helium,hydrogen,nitrogen) of nuclei to form_______(hydrogen,lithium,helium) , but larger stars can produce elements as heavy as______(copper,silver,iron)
Nuclear fusion is the process of combining two lighter nuclei into a single heavy nucleus (part of an atom). This process is also called a nuclear reaction and it releases a large amount of energy. In medium-sized stars such as the Sun, nuclear fusion almost always means the fusing of hydrogen atoms to form helium, but larger stars can produce elements as heavy as iron.
