Wesley T 2

Plato

440 BCE

Made the theory of forums provides a solution to the universals and believes the physical world is not real

Democritus

400 BCE

Thought atoms where specific to the material where they were composed

Aristotle

322 BCE

There is always something bigger that is greater than most other beings

Lavoisier

Oct 29, 1789

Made the role of oxygen in combustion and respiration and named hydrogen

John Dalton

Oct 28, 1808

All mater is made up of indestructible atoms with mass and properties

The Alchemists

Nov 6, 1808

By using the four basic elements he made proof of the atom which helped rest of time

Newlands Law of Octave's

Oct 17, 1864

When elements put together in increasing order of their atomic masses, the properties of the eighth element are a repeating of the first elements properties.

Mendeleev's Pd. Table

Oct 31, 1869

Mad a connection that chemical and physicals properties are connected to there atomic mass

Photoelectric effect

Oct 25, 1887

Electrically charged particles going out from or within the material when it takes in radiation

Discovery of radioactivity

Oct 19, 1896

The outgoing of rays by certain atoms is what radioactivity and was discovered by a French physicist Pierre

Discovery of the electron

Oct 21, 1897

While experimenting with cathode test tubes he found each tiny particle has a negatively charged electron

Planck's Quantum theory of light

Nov 8, 1900

Light bulbs should have 3200 kelvin to make sure the most energy is being used

Discovery of the Proton

Oct 18, 1903

He proved that hydrogen atoms have the same nuclei in all other atoms and led to the splitting of the atom

Plum Pudding Model

Oct 20, 1904

It is Negative electrons surrounded by positive charges

Rutherford's Gold Foil Experiment

Oct 22, 1908

If alpha particles were to hit a piece of gold foil then it would go right through and would show that it has mostly empty space

Bohr's Planetary Model

Oct 18, 1913

The electrons in the nucleus of the atom in orbits And when in this orbit the energy is fixed

Robert Millikan

Nov 1, 1913

The elementary charge of an electron using an experiment with the oil dropper

Mosley's Atomic Numbers

Nov 5, 1914

Number of positive charges in the nucleus

charge of the electron

Nov 4, 1923

Got electrons by using oil droplets that have a negative charge

Schrodinger Equation

Nov 7, 1926

A linear partial that takes over the functions of a quantum mechanical system

Heisenberg Uncertainty Principle

Oct 23, 1927

we don't know the place or the speed of the particle with accurate accuracy

Discovery of the neutron

Oct 24, 1932

Put lots of beryllium with alpha particles that cause the natural rad decay of polonium