chem revision
- Created by: dav09
- Created on: 03-12-20 18:02
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- chemistry revision
- The number of protons in an atom of an element is its atomic number.
- number of protons = atomic number
- number of electrons = atomic number
- number of neutrons = mass number - atomic number
- To find the relative formula mass (Mr) of a compound, you add together the relative atomic mass values (Ar values) for all the atoms in its formula.
- Find the Mr of sodium oxide, Na2O.The Ar of sodium is 23 and the Ar of oxygen is 16.The Mr of sodium oxide is (23 × 2) + 16 = 62.
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