atom - Smallest particle of an element made up of electrons, protons and neutrons, electron - sub atomic particle that carries a negative charge. Orbits the nucleus, matter - Anything that has mass and volume, solid - State of matter with definite shape and volume, neutron - A subatomic particle with about the same mass as a proton. Has no electric charge and is located in the nucleus, proton - A subatomic particle that carries a positive charge. Located in the nucleus and has an atomic mass of 1, nucleus - Small dense center part of an atom. , liquid - substance that flows freely, gas - has no fixed shape or volume, plasma - 4th state of matter newly recognized,
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Structure of Matter/Molecular changes in energy
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