Atomic structure

• Relative mass and atomic charge of a neutron

  Mass 1

  Charge 0
• Relative atomic mass and charge of an electron

  Mass 1/1800

  Charge -1
• Isotopes


  atoms of the same element with the same number of protons, but different numbers of neutrons
• Relative isotopic mass


  the mass of one isotope compared to one-twelfth of the mass of one atom of carbon-12
• Relative atomic mass

  the weighted mean mass of one atom compared to one one-twelfthtwelfth of the mass of one atom of carbon-12
• Relative molecular mass


  the average mass of a molecule compared to one-twelfth of the mass of one atom of carbon-12
• eq if the relative abundance is used instead of percentage abundance in RAM


  isotopic mass x relative abundance /total relative abundance