1. Destiny Harris , Mira , Marcus, Taylor
Discovery Of Atom
Destiny Harris , Mira , Marcus, Taylor

2. The Discovery of the Atom
First Theory proposed by Democritus in 400 BCE
Modern Atomic Theory by Dalton
Proposed in 1803

3. Discovery of the Nucleus
Ernest Rutherford discovered the nucleus in 1911
Used the gold foil experiment

4. Discovery of the Proton
Eugen Goldstein in 1886
Discovered positive canal rays
Rutherford later named them protons
and definitively ID’d them as a part of the
atom.

5. Discovery of the Neutron
James Chadwick discovered the neutron in 1932

6. Discovery of the Electron Part 1
JJ Thompson discovered the particle in 1897
Robert Millikan discovered the charge of the electron in 1909.

7. Discovery of the Electron Part 2
Niels Bohr proposed that electrons move about the nucleus in orbits in 1913
Werner Heisenberg, in 1927, asserted that it is impossible to know for certain the location and speed of an electron—called The Heisenberg Uncertainty Principle.

8. Discovery of Radioactivity
Henri Becquerel discovered radioactivity in 1896
Frederick Soddy, in 1903, discovered that radioactivity is due to transmutation of elements— “heavier” elements decay into “lighter” elements.