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