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WOR8294 Assaying and Refining of Gold[1]
Revision Notes C1. C1.1 Fundamental ideas Atomic Number = The number of protons in each atom of an element e.g. oxygen = 8. Mass Number = The number of.
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Hydrogen is the lightest element. It is by far the most abundant element in the universe and makes up about about 90% of the universe by weight. Hydrogen.
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