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This Concept Map, created with IHMC CmapTools, has information related to: billieruthannm, neutrons have no charge, protons have a positive electrical charge, protons gives it the chemical identity, atoms are mostly empty space, Has mass it can be measured, Takes up space when energy is added, has three common forms one is liquid, atoms are made of protons, has other states another is plasma, atoms nucleus is densely packed with protons and neutrons, atoms nucleus the number of elctrons equals the protons, atoms are made of neutrons, Matter also has other states, Matter it Takes up space, has three common forms one is solid, atoms nucleus electrons are in a cloud around the nucleus, electrons have a negative electrical charge, Takes up space it contracts when cold, Matter can has three common forms, atoms can join together to form molecules