Atomic structure and the periodic table


The nucleus:

  • sits in the middle of an atom
  • contains protons (+ charge) and neutrons (0 charge) 
  • Has a radius of around 1x10-14M
  • It has a positive charge, thanks to the protons. CHEERS
  • most of the mass is in the atom

The Electrons:

  • move around the nucleus in electron shells
  • they're negativley charged, and very small, but they take up a lot of space.
  • the volume of their orbit determines the size of the atom
  • Electrons have virtuaaly no mass.

1) atoms are neutral…


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