Atomic Particles

• Fundamental atomic particles


  Protons and neutrons in the nucleus.

  Electrons in charge cloud.
• Atomic number of an atom


  Number of protons in the nucleus.

  Equal to number of electrons in a neutral atom E.G Sodium.
• Mass number of atom


  The number of protons plus the number of neutrons in the nucleus
• Isotopes of atoms


  Atoms of the same element with the same amount of protons and different number of neutrons.

  Same chemical properties as these are determined by number of electrons which stays the same
• Relative mass

  Mass of particle relative to 1/12 mass of 1 atom of C12
• Relative charge


  Charge of particle relative to that of one electron.
• Relative mass and charge off protons, neutrons and electrons.


  Particle Mass Charge

  Proton 1 +1

  Neutron 1 0

  Electron 1/1800 -1