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variation in a repetitive way as you move through the periodic table vertically or horizontally.
measurement of a solution in moles per cubic decimetre.
a white crystalline organic compound used as a fertilizer, in medicine and in resins.
the part of the Earth's hydrosphere that is made of frozen water.
above the mesopause, at a height of 130 km.
the rate of the forward reaction equals the rate of the reverse reaction.