atomic structures 0.0 / 5 ? ChemistryThe Periodic TableASEdexcel Created by: dragonfruitjamCreated on: 30-03-15 14:28 relative atomic mass The average weighted mass of an atom for an element divided by 1/12 the mass of c 12 1 of 9 relative isotopic mass the weighted mass of an atom of an isotope divided by 1/12 the mass of a carbon atom 2 of 9 relative molecular mass the average weighted mass of a molecule for a compund divided by 1/12 the mass of c12 3 of 9 atomic number the number of protons and neutrons in a nucleus of an atom of that element 4 of 9 electronegativity a nuclei ability to attract a pair of electrons in a covalent bond 5 of 9 first ionization energy the energy required to remove 1 electron from each atom in 1 mole of an element in its gaseous state 6 of 9 Isotopes are atoms of the SAME element which have the SAME number of protons but different number of neutrons. 7 of 9 1st ionisation energy the amount of energy required per mole to REMOVE one electron from each gaseous atom to form a singly positive ion 8 of 9 1st electron affinity the energy change per mole for the ADDITION of one electron to a gaseous atom to form a singly negative ion 9 of 9
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