Melting Point - The temperature at which a solid changes to a liquid. (Physical Change), Sublimation - the process of a solid changing to a gas (ex: dry ice), Evaporation - change in state from a liquid to a gas (+heat), Condensation - change in state from a gas to a liquid (-heat), Atom - The smallest unit of matter that retains the identity of a substance., Proton - Subatomic particle with a positive charge and located in the nucleus of an atom. The number of protons gives the atom its identity., Neutron - Subatomic particle with no charge (neutral), the same mass as a proton, and located in the nucleus of an atom., Electron - Subatomic particle with a negative charge and located outside the nucleus., Valence electron - electrons located on the last shell or energy level of an atom, Nucleus - The center of the atom - made up of protons and neutrons,

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