Solids have a definite shape and volume., Gases can easily change both shape and volume., Sublimation is the process of a substance changing directly from a solid to a gas., Condensation is the process of a gas changing into a liquid., The melting point is the temperature at which a solid turns into a liquid., Evaporation is the process of a liquid changing into a gas at its surface., The periodic table is a tabular arrangement of chemical elements., Elements in the same group of the periodic table have similar chemical properties., The atomic number of an element represents the number of protons in its nucleus., Halogens are highly reactive non-metals., Mercury is the only metal that is liquid at room temperature., Elements in the same column of the periodic table have similar valence electron configurations.,

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