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OCR Chemistry AS level. definitions for atoms, ions and compounds, and amount of substance.
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definition of isotope
definition of isotope
atoms of the same element with different numbers of neutrons and different masses.
definition of polyatomic ions
definition of polyatomic ions
an ion containing more than one atom
definition of water of crystallisation
definition of water of crystallisation
water molecules that are bonded into a crystalline structure of a compound
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