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the phase change of a substance from the solid phase directly into the gas phase without passing through an intermediate liquid phase.
the energy level, or shell, of an atom that contains the valence electrons.
the relationship between volume and pressure for a fixed amount of a gas at constant temperature...
a relative measure of the mass contribution of each component in a compound. The percentage...
the smallest particle of an element that can exist on its own (the basic building block of...
mass per unit volume of a substance. The number of molecules in a particular area or a measure...