How are the number of protons and electrons related to the charge of an ion?

Protons have a positive charge, electrons are negative; say theres 5 protons and 5 electrons, those cancel each other out therefore it would be neutral or just no charge. If there is more protons then electrons then it would be a positive ion, if there is more electrons then protons then it would be a negative ion

Naoh + hbr -> nabr (salt) + h2o ca (oh)2 + 2hbr - - - > ca (br)2 + 2h2o