History of the Atom Timeline by Kaylon and Cache'

Democritus

442

~That atoms are breakable to a certain extent.
~That if you keep breaking it how many breaks until it can't break anymore. He didn't he just thought, but his idea was dismissed and classified as worthless.
~he thought it looked like a ball.

Dalton

Feb 21, 1803

~That atoms are identical but different from the atoms of other elements.
~He tested that chemical reactions consist of rearranging atoms in simple whole number ratios.(Mrs. Harvey's Unit 5 notes)
~He thought that the atoms were tiny invisible indestructable particles.

Thomson

Feb 21, 1904

~atoms consist of a large sphere of uniform positive charge embedded with smaller negatively charged particles.
~He thought it looked similar to a solid small billboard ball

Rutherford

Feb 21, 1911

~That all the mass concentrated at its center, in a nucleus, with the vast majority of the atom consisting chiefly of empty space.
~He used his results from an experiment to come up with his discovery. Also he took Thompson's atom to a fly in cathedral; now known as the planetary model because electrons orbit the nucleus like planets around the sun.
~he thought it was a similar look to the solar system.

Bohr

Feb 21, 1913

~He discovered that electron orbit the nucleus.
~He used the Quantum Model of the Atom to comcluded that electrons orbit the nucleuswithout losing energy. Also that electrons could move only in fixed orbits of specific energies. Electrons with low energy would orbit closer to the nucleus while electrons with high energy orbit further from the nucleus. He thought it looked like a dot in te middle wit small eletrons surrounding it

Heisenburg

Feb 24, 1927

~He discovered how many electrons, protons, and neutrons come with the atom.
~He also studied the behavior of electrons and how they act within the atom.
~He thought the atom looked like a planet orbiting the nucleus.

Schrodinger

Feb 24, 1930

~He theorized that electrons aren't particles taht they're waves. In the physics world they only care about the energy level.
~He discoverd the electron cloud by experimenting and recording data.
~ He thought it looked like a nucleus in the middle with a clould like surronding it.

Aristotle

Mar 2, 2022

~He discovered that matter must be made of smaller pieces because things can contiously be broken into smaller pieces. He also thought that matter eas made of elements such as earth, wind, fire, and air.
~His thoughts and the thoughts of democritus. He kind of had an idea of where to start ffrom correcting Democritus's theory.
~He thought it was a mixture of different elements mixed together.