Positively charged atomic particles are called protons. These particles, along with neutrons, exist in the nucleus of the atom. Protons and neutrons each have an atomic mass of one.
Each element on the periodic table is denoted by the element's atomic number, which amounts to the number of protons in its nucleus. The number of protons in the nucleus balances out the number of electrons, or negatively charged particles, so a neutral atom has the same number of protons as electrons. Only ions have a different number of protons and electrons. The positive charges of the protons attract the negative charges of the electrons, keeping them in orbit. The atomic mass number of an element is the total number of protons and neutrons in the nucleus of an atom.