sentences: a proton has a positive 1 electric charge & a neutron has a neutral 0 electric charge ->  protons and neutrons together will be positive in electric charge  protons and neutrons together will be positive in electric charge & the nucleus of an atom is made of protons and neutrons ->  the nucleus of an atom is positve in electric charge  the nucleus of an atom is positve in electric charge & the nucleus is the center of an atom -> the positive charge is concentrated in the center of an atom