A-level Chemistry

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9 Terms

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Relative molecular mass

The average mass of the atoms of a single molecule of a compound, relative to the mass of 1/12 of carbon-12 atom

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Relative formula mass

The average mass of the atoms of a formula of a compound, relative to the mass of 1/12 of carbon-12 atom

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Mole

The amount of substance that contains the same number of particles as the number of carbon atoms in exactly 12g of the carbon-12 isotope

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Avogadro constant

the number of ¹²₆C atoms in exactly 12g of ¹²₆C

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Atomic number

Number of protons in the nucleus of an atom of that element

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Mass number

Number of protons&neutrons in the nucleus of an atom of that element

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Isotope

Atoms of the same element with same number of protons and different number of neutrons

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Relative atomic mass

The weighted average mass of an atom of an element, compared to the mass of 1/12 of carbon-12 atom

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Relative isotopic mass

The mass of an atom of an isotope, compared to the mass of 1/12 of carbon-12 atom