history of the atom

• Dalton's model- atoms are tiny spheres that cannot be broken down
• John Dalton proposed that atoms are indivisible, unchangeable particles
• J.J Thompson- plum pudding model.
• Plum pudding model- the atom is a ball of positive charge with electrons embedded in it.
• Rutherford's model- an atom has a nucleus with a positive charge, and electrons orbit the nucleus.
• Rutherford scattering experiment- proved that there was a nucleus of dense positive charge that was strong enough to repel the alpha particles.
• Bohr - electrons orbit the nucleus in shells, electrons in shells have different energy shells.
• Chadwick- discovered the neutron.
• Scientific models change due to new experimental evidence.