history of the atom

• first, dalton described atoms as solid spheres but thomson suggested that atoms were more like plum puddings as his measurements showed it must contain electrons
• rutherfords experiments proved that there are empty spaces between the positively charged particles (nuclei) and negatively charged particles (electrons)
• rutherfords experiment was firing alpha particles at gold foil expecting them to pass straight through but some deflected
• rutherfords model was a nuclear model that suggested that the atom was made up of a tiny positively charged nucleus surrounded by a cloud of negatively charged electrons with a lot of empty space
• bohr suggested that electrons orbit the nucleus in shells so the atom doesnt collpase
• further experiments allowed rutherford to dsicover the proton
• chadwick discovered the neutrons time after