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Isotopes
Atoms of the same element with different number of neutrons and different masses
Relative isotopic mass
The mass of an isotope compared to one twelfth of the mass of a carbon-12 atom.
Relative atomic mass
Weighted mean mass compared with 1/12th of the mass of an atom of carbon-12
Charge on NO3 (nitrate)
-1
Charge on SO4 (sulfate)
2-
Unit for amount of substance
Mole symbol ‘mol’
Units of molar mass
g mol^-1
Empirical formula
The simplest whole number ratio of atoms of each element present in a compound (def not required)
Molecular formula
The number and type of atoms of each element in a molecule (def not required)
Anhydrous
A substance that contains no water.
Definition of hydrated
A substance that contains water
Definition of water of crystallisation
Water molecules that are incorporated into the crystalline structure of a compound, often essential for maintaining its stability and integrity.
Note 
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