*atoms

• all atoms of a particular element are the same and different elements have different atoms
• Atoms


  
  

  are made up of three kinds of particles: protons, neurons and electrons which are smaller particles called sub-atomic particles.

  
  

  the particles are arranged in a similar way in all atoms.
• Diff particles of an atom have Diff properties

  • electrons have almost no mass whilst protons and neutrons have more than it
  • protons and neutrons have the same mass
  • protons have a positive electrical charge
  • neutrons have no electrical charge
  • electrons have a negative electrical charge
  • number of atoms = number of electrons

  
• there is a lot of empty space between parts of the atom
• Electrostatic Attraction


  the attraction between the positive and negative charges and what holds individual atoms together.