Chemistry AS DEFINITIONS :) 3.5 / 5 based on 4 ratings ? ChemistryASOCR Created by: 94Y86Created on: 03-10-12 18:24 Isotopes Atoms of the same elements with different numbers of neutrons 1 of 10 Atomic number The number in the nucleus of an atom 2 of 10 Mass number The number of particles in the nucleus (protons and neutrons) 3 of 10 Relative Isotopic mass The mass of an atom of an isotope compared to 1/12th ofthe mass of an atom of carbon-12 4 of 10 Relative Atomic mass The weighted mean mass of an atom of an element compared to 1/12th of the mass of an carboon-12 atom 5 of 10 Relative Molecular mass The weighten mean mass of a molecule compared with 1/12th of the mass of a cabon-12 atom 6 of 10 Relative formula mass the weighted mean mass of the formula unit compared with 1/12th the mass of an atom of carbon-12 7 of 10 The mole The amount of any substance containing as many particles as there are carbon atoms in exactly 12g of the carbon-12 isoptope 8 of 10 Avagadros constant 6.02 X 10^23 mol^-1 9 of 10 Molar mass The mass per mole of a substance, usually measued in g mol^-1 10 of 10
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