The basic building blocks of the "normal" matter that we see in the Universe are atoms, and combinations of atoms that we call molecules.
The number of protons (or the number of electrons) is called the atomic number for the atom. The total number of protons plus neutrons is called the atomic mass number for the atom. Atoms are electrically neutral because the number of negatively-charged electrons is exactly equal to the number of positively-charged protons. The number of neutrons is approximately equal to the number of protons for stable light nuclei, and is about 1 - 2 times the number of protons for the heavier stable nuclei.