Can someone me fill in the blanks? it's about atoms, neutrons, protons, electrons etc! so much!

Atoms contain a nucleus and orbitals. Protons and neutrons are within the nucleus and electrons are in the orbitals. The number of protons represents the atomic number. The atomic mass is the sum of the protons and neutrons. When the number of neutrons differ, it is called an isotope, like C12, C13, C14. The number of neutrons affect the stability.

Dthrough a slow process