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all matter is made of particles (molecules or atoms) that are in constant motion.
electrons that have been emitted from the nucleus of an atom of a radioactive element.
temperature at which a substance changes phase from a liquid to a solid at a specific or fixed...
horizontal rows of elements in the periodic table that are arranged according to their atomic...
electromagnetic waves, similar to X-rays, but with a much shorter wavelength.
the energy that objects or particles have as a result of their motion.