Chemistry 0.0 / 5 ? ChemistrySpectroscopyASOCR Created by: Samiya72Created on: 22-02-15 23:29 Mass Number Total number of protons and neutrons in the nucleus 1 of 12 Atomic Number Number of protons in the element 2 of 12 Isotopes Same proton number but different number of neutrons 3 of 12 Relative Atomic Mass Average mass of an atom of an element on a scale where an atom of carbon is 12 4 of 12 Relative Isotopic Mass Average mass of an atom of an isotope of an element on a scale where an atom of carbon is 12 5 of 12 Relative Molecular Mass Average mass of a molecule on a scale where carbon-12 is 12 6 of 12 Vaporisation Sample is turned into gas using electrical heater 7 of 12 Ionisation Gas particles are bombarded with high energy electrons to ionise them. Electrons are knocked out of the particles, leaving positive ions 8 of 12 Acceleration The positive ions are accelerated by magnetic field 9 of 12 Deflection Positive ions are altered by the magnetic field. Lighter ions have less momentum and are deflected more than heavier ions. 10 of 12 Detection Magnetic field is slowly increased and different ions reach the detector and different times and a mass spectrum is produced. 11 of 12 First ionisation energy The energy needed to remove one electron from each atom in one mole of gaseous atoms to make one mole of gaseous 1+ ions 12 of 12
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