Atoms, Bonds and Groups 1.1 0.0 / 5 ? ChemistryBonding & shapesASEdexcel Created by: Nina SkinnerCreated on: 29-03-13 11:11 atoms of the same element with different numbers of neutrons Isotopes 1 of 22 the number of protons in the nucleus of an atom atomic (proton) number 2 of 22 the number of particles (protons and neutrons) in the nucleus mass (nucleon) number 3 of 22 a positively or negatively charged atom or (covalently bonded) group of atoms (a molecular ion) ion 4 of 22 the mass of an atom of an isotope compared with one-twelfth of the mass of an atom of carbon-12 relative isotopic mass 5 of 22 the weighted mean mass of an atom of an element compared with one-twelfth of the mass of an atom of carbon-12 realtive atomic mass Ar 6 of 22 the weighted mean mass of a molecule compared with one-twelfth of the mass of an atom of carbon-12 relative molecular mass Mr 7 of 22 the weighted mean mass of a formula unit compared with one-twelfth of the mass of an atom of carbon-12 relative formula mass 8 of 22 the quantity whose unit is the mole. Chemists use it as a means of counting atoms. Amount of substance 9 of 22 the number of atoms per mole of the carbon-12 isotope avagadro constant 10 of 22 the amount of any substance containing as many particles as there are carbon atoms in exactly 12g of the carbon-12 isotope mole 11 of 22 the mass per mole of a substance. maolar mass M 12 of 22 the simplest whole-number ratio of atoms of each element present in a compound empirical formula 13 of 22 a small group of atoms held together by covalent bonds molecule 14 of 22 the actual number of atoms of each element in a molecule molecular formula 15 of 22 the volume per mole of a gas molar volume 16 of 22 the amount of solute, in mol, dissolved per 1dm3 of solution concentration 17 of 22 a solution of known concentration. standard solutions are normally used in titrations to determine unknown information about another substance standard solution 18 of 22 any type of particle that takes part in a chemical reaction species 19 of 22 the molecular relationship between the relative quantities of substances taking part in a reaction stoichiometry 20 of 22 a species that is a proton donor acid 21 of 22 a species that is a proton acceptor baee 22 of 22
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