More structure of matter Atoms are made up of nucleus, very dense, contains protons, positively charged,heavy neutrons, no charge about same mass as protons protons and neutrons are made up of quarks orbited by electrons, negatively charges, light fundamental particle, no structureMore structure of matter ◼ Atoms are made up of ◼ nucleus, very dense, contains ◼ protons, positively charged, “heavy” ◼ neutrons, no charge, about same mass as protons ◼ protons and neutrons are made up of quarks ◼ orbited by ◼ electrons, negatively charges, “light” ◼ fundamental particle, no structure