We need to know these definitions for the exam on thursday, good luck!


Relative Atomic Mass

The relative atomic mass is the (weighted) mean mass of an atom of an element, compared to 1/12th the mass of an atom of Carbon-12.

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Relative Isotopic Mass

The relative isotopic mass is the mass of an isotope of an element relative to 1/12th the mass of an atom of Carbon-12.

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First Ionisation Energy

First ionisation energy is the energy needed to remove 1 electron from each atom in 1 mole of gaseous atoms, to form 1 mole of gaseous 1+ ions.

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Electronegativity is a measure of how strongly an atom can attract the bonded pair of electrons.

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Isotopes are atoms of the same element/same number of protons, with a different number of neutrons/different mass number.

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Molar Mass

Molar Mass is the mass per mole of a substance.

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Empirical Formula

The Empirical Formula is the simplest whole number ratio of atoms in each element present in a compound.

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Molecular Fomula

The Molecular Fomula is the actual number of atoms of each element in a molecule.

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