Chemistry - Atomic Structure

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  • Created by: Perri
  • Created on: 17-03-10 17:05
  • All matter is compose of atoms.
  • The nucleus of an atom contains positive protons, with a relative mass of 1 and relative charge of +1, and neutral neutrons (except hydrogen), with a relative mass of 1 and no charge.
  • Electrons orbit the nucleus in energy levels. An electron has a negative charge of -1 and very small mass.
  • The number of electrons in an atom equals the number of protons, to give a neutral atom.


  • The atomic number 'Z' is equal to the number of protons in the nucleus.
  • The mass number 'A' is equal to the number of protons plus the number of neutrons in the nucleus.
  • Isotopes of an element have the same number of protons but different numbers of neutrons.


  • Producing a mass spectrum involves ionisation, acceleration, deflection and detection of the sample

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