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atomic mass unit â measured as 1 twelfth of a C-12 atom.
variation in a repetitive way as you move through the periodic table vertically or horizontally...
bonds that form between the hydrogen atom of one molecule and an oxygen, nitrogen or fluorine...
a method used to refine petrol by breaking covalent bonds between carbon atoms using heat and a...
rechargeable cells, such as the lead acid accumulator used in motor vehicles.