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A nucleus with 4 protons has a positive charge of 4.
Protons exhibit a positive charge and it is enclosed with the nucleus of an atom. There are many theories that revolved around this concept, but it was concluded by Ernest Rutherford, that the atom has a dense positively charge center which he called the nucleus. The negative charge particles of the atom is called the electrons, which was discovered by John Joseph Thomson when he was working with the cathode ray tube. The number of electrons of an atom is equal to the number of protons, which makes an atom neutral. There are cases that electrons are gained or loss, called Ionization. This means that there will be a difference in the number of protons and electrons.