Chemistry Definitions 0.0 / 5 ? ChemistryAtomic Structure and Amount of SubstanceASAQA Created by: Emily Sampson- BarnesCreated on: 05-10-13 20:32 Mass Number Total number of protons and neurons in an atoms nucleus 1 of 11 Atomic Number Total number of protons in an atoms nucleus 2 of 11 Isotope Atoms of the same element with a different number of neutrons 3 of 11 Relative Atomic Mass Average mass of an atom relative to 1/12 the mass of one carbon-12 atom 4 of 11 Relative Molecular Mass Average mass of of a molecule relative to 1/12 the mass of one carbon-12 atom 5 of 11 Relative Isotopic Mass The mass of an isotope of an element relative to 1/12 the mass of one carbon-12 atom 6 of 11 Relative Formula Mass Average mass of a formula relative to 1/12 the mass of one carbon-12 atom 7 of 11 First Ionisation Energy The enrgy required to remove one electron from one mole of gaseous atoms 8 of 11 Mole The unit of amount of substance, roughly 6x10(23) particle 9 of 11 Avagadro's Constant Number of particles in a mole 10 of 11 Molar Mass Mass of the substance that contains one mole of that substance (g) 11 of 11
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