Answer 3.2

a) Decide: right or wrong?

  • Isotopic patterns depend on the elemental composition of an ion.  YES
  • Isotopic patterns depend on the ionization method used.  NO
  • The monoisotopic peak is always the most abundant peak within an isotopic pattern.  NO
  • The monoisotopic peak is always the peak of lowest m/z within an isotopic pattern.  YES
  • Isotopic distributions depend on the charge state of an ion.  NO
  • The charge state of an ion can be determined from the distance of isotopic peaks.  YES

Do you memorize the isotopic compositions of fluorine, chlorine, bromine, and iodine?

  • Fluorine: monoisotopic
  • Chlorine: 35Cl : 37Cl = 4 : 1
  • Bromine: 79Br : 81Br = 1 : 1
  • Iodine: monoisotopic