Thomas and rutherford

• Thomas was the first to use the term "nucleus"
• Rutherford's experiment showed that most mass is concentrated at the centre, with electrons orbiting around it.
• Rutherford's experiment involved firing alpha particles at thin sheets of gold foil, which were then detected by a fluorescent screen on the other side.
• The majority of alpha particles passed straight through the gold foil without being deflected or scattered.
• A small number of alpha particles were deflected from their path when they collided with atoms within the gold foil.
• Protons have a positive charge and are found in the nucleus.