Who discovered the electron?

Who created a model of the atom with electrons moving around the nucleus in fixed orbits?

Who did the gold foil experiment?

Who discovered that the proton had a positive charge?

Believed that the universe was made of tiny uncuttable particles

Created the first periodic table.

Greek philosopher

Found the missing mass of the atom's nucleus

Determined that the properties of elements are periodic (or in trends)

Uncertainty principle (a particle's position, energy and time can never be precisely known)

Discovered the neutron

Hypothesized that the atom was a tiny hard sphere

Discovered that the atom is mostly empty space

Believed that atoms of a given element are identical

Created the atomic theory

Use the cathode ray tube in his discovery

Created the plum pudding model of the atom.

Worked with the Quantum Theory

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