Relative atomc mass - The weighted mean mass of an atom of an element, compared to 1/12 of the mass of carbon-12, Relative isotopic mass - The mass of an atom of an isotope of an element compared to 1/12 of the mass of carbon-12, Mass spectrometer - Used to determine the abundance of different isotopes in a sample, Relative molecular mass - The average mass of a molecule compared to 1/12 of the mass of an atom of carbon-12, Relative formula mass - The average mass of a formula unit compared to 1/12 of the mass of carbon-12, Avogadro constant - The number of particles in one mole of a substance, Molar mass - The mass of one mole of something, Concentration - How many moles are dissolved per 1dm3 of solution, Van der Waals' forces - Include both permanent dipole-dipole and induced dipole interactions, Ionic bond - An electrostatic force of attraction between oppositely charged ions, Covalent bond - An electrostatic force of attraction between nuclei and a shared pair of electrons, Hydrogen bonding - A bond formed between the hydrogen of one molecule and a lone pair of electrons in another molecule,

A level Chemistry key terms

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