-
Eugen Goldstein discovered that atoms had positive charges
thomson originally thought that atoms looked like pieces of raisin bread and the negatively charged ones where the raisins, inside the bread -
J.J Thomson discovered the electron
he suggested that the atom wasnt an invisible particle . his noti\on of the electron came from his work, they used a cathode ra\y tube that would pass astream of glowing material, no one could explain what it was or how it was glowing but he found out that the glowing stream would bend toward a positively charged electric plate. the stream was made up of atoms that carried a negative charge. -
Ernest Rutherford proved Thomsons raisin bread structure incorrect
Rutherford has performed many experiments w\ith radioactive alpha particles, he would fire the particles at solid objects, he saw that most of the particles would pass right through the object while a small amount of them would pass through at an angle and some even bounced straight back -
Rutherford proposed a revolutionary view of the atom
he suggested that the atom was made up of a small dense core with positively charged particles in the center sorrounded by a swirling ring of electrons. his atom resembled a small solar system with the positively charged nucleus always in the center and the electrons always revolving around it. -
James Chadwick discovered the neutron
the neutrons help stablilize the protons in the atoms nucleus, since the nucleus is so tightly packed together, the positively charged protons would repel eachother. neutrons always reside in the nucleus and they don't have an electric charge.
