AS Chemistry Keywords Edexcel 0.0 / 5 ? ChemistryThe Periodic TableASEdexcel Created by: [email protected]Created on: 04-06-17 18:01 Relative Atomic Mass the average mass of an atom of an element, compared to the 1/12th the mass of an atom of a carbon-12 isotope 1 of 14 relative molecular mass the sum of the relative atomic masses of all the atoms in its molecular formula 2 of 14 relative formula mass the weighted average mass of the formula units relative to 1/12th of the mass of a carbon-12 isotope 3 of 14 relative isotopic mass the mass of an atom of an isotope compares to the mass of an atom of a carbon-12 isotope 4 of 14 use of mass spectrometer to find the relative atomic masses of an atom or determine the structure of a molecule 5 of 14 stages of mass spectrometer ionisation, acceleration, deflection, detection 6 of 14 ionisation energy down a group decreases 7 of 14 ionisation energy across a period increases 8 of 14 1st ionisation energy the enthalpy required to remove 1 mole of electrons from 1 mole of gaseous atoms to form 1 mole of 1+ gaseous ions 9 of 14 2nd ionisation energy the enthalpy required to remove 1 mole of electrons from 1 mole of gaseous atoms to form 1 mole of 2+ ions 10 of 14 4 types of subshell s,p,d,f 11 of 14 shape of S orbitals sphere 12 of 14 shape of P orbitals figure of 8 13 of 14 isotope atoms of the same element with the same number of protons, but different number of neutrons 14 of 14
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