Condensation - Change in state from a gas to a liquid (-heat), Evaporation - Change in state from a liquid to a gas (+heat), 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., Freezing point - The temperature at which a liquid changes to a solid. (Physical Change), Melting point - The temperature at which a solid changes to a liquid. (Physical Change), Boiling point - The temperature at which a liquid changes to a gas. (Physical Change), Element - A substance that cannot be broken down by any means. Made up of one type of atom., Isotope - Each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but same chemical properties,

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