Definitions module 1 0.0 / 5 ? ChemistryWhole moduleASCCEA Created by: siân mcgarelCreated on: 24-01-14 22:06 Atomic number The number of protons in the nucleus of an atom of an element 1 of 7 Mass number The number of protons and neutrons in the nucleus of an atom of an element 2 of 7 Relative atomic mass The average mass of one element relative to 1/12th the mass of an atom of C-12 3 of 7 Relative molecular mass The average mass of one molecule of a substance relative to 1/12th the mass of an atom of C-12 4 of 7 Isotope Atoms of the same element with the same number of protons but different numbers of neutrons 5 of 7 Relative isotopic mass The mass of an isotope relative to 1/12th the mass of an atom of C-12 6 of 7 1st ionisation energy The energy required to remove an electron from one mole of gaseous atoms to form gaseous ions with a +1 charge 7 of 7
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