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Atoms
Term | Definition |
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Relative Isotopic Mass | The mass of an atom of an isotope compared with one-twelfth of the mass of an atom of carbon-12 |
Relative Atomic Mass | The weighted mean mass of an atom of an element compared with one-twelfth of the mass of an atom of carbon-12 |
Relative Molecular Mass | The weighted mean mass of a molecule compared with one-twelfth of the mass of an atom of carbon-12 |
Relative Formula Mass | The weighted mean mass of a formula unit compared with one-twelfth of the mass of an atom of carbon-12 |
Amount of Substance | The quantity whose unit is the mole. Chemists use amount of substance as a means of counting atoms |
The Avogadro Constant | Ther number of atoms per mole of the carbon-12 isotope (6.02*10^23) |
A Mole | The amount of any substance containing as many particles as there are carbon atoms in exactly 12g of the carbon-12 isotope |
Molar Mass | The mass per mole of a substance |
Empirical Formula | The simplest whole number ratio of atoms of each element present in the compound |
Molecule | A small group of atoms held together by covalent bonds |
Molecular Formula | The actual number of atoms of each element in a molecule |