Chapter 2

• What is an electrons relative mass?

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• What is the atomic number?

  • The Proton number
• What is the mass number?

  • Number of protons + neutrons
• Relative isotopic mass :

  • The mass of an isotope relative to 1/12 th of the mass of an atom of carbon-12
• Relative atomic mass :

  • The weighted mean mass of an atom of an element relevant to 1/12 th of the mass of an atom of carbon-12
• Mass to charge ratio =

  • Relative mass of ion / relative charge on ion