The fusion reaction in the sun is a combination of hydrogen atoms fusing to create helium. The fusion reaction in larger stars involve much heavier elements like oxygen and iron. In supernovas, often elements like gold are produced
The nucleus of an atom contain neutrons and protons, and energy levels surround the nucleus, in rings and contain electrons
Chemical Equation Balancer
The atomic number is the number of protons in the nucleus of an atom. The number of protons define the identity of an element.