a neutron has a neutral electric charge & a proton has a positive 1 electric charge ->  protons and neutrons together will be positive in charge  protons and neutrons together will be positive in charge & the nucleus of an atom is made of protons and neutrons ->  the nucleus of an atom is positive in charge  the nucleus of an atom is positive in charge & the nucleus is the core of an atom ->  an atom has a positve charged core  the nucleus is the core of an atom & the nucleus of an atom is surrounded by  almost empty space ->  the core of an atom is surrounded by almost empty space  an atom has a positve charged core & the core of an atom is surrounded by almost empty space -> an atom has a positive core surrounded by mostly empty space