History of the Atom

kanada

200

• Came up with the whole atom theory• considered the atom to be indestructible,• His theory is far more advanced than lots of further scientists.

democritus

460

• Father of modern Science• Him and Leucippus were know to be the first to come up with the atomic theory.

Robert Boyel

Aug 3, 1662

• Published book Showing a new atomic theory• Discovered that The four elements cant be separated, an atom can be cut unlimited times but not but separated.• Foundation for modern chemistry.
Diagram
http://upload.wikimedia.org/wikipedia/commons/thumb/1/15/Boyles_Law_animated.gif/300px-Boyles_Law_animated.gif

Antoine Lavoisier

Nov 3, 1743

• Matter may change its form but its mass stays the same.• Wrote the first list of elements.• Discovered and named oxygen and hydrogen.
Diagram:
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Sir William Crookes

Jun 17, 1832

• Discovered Cathode rays travel in straight lines• They send a negative charge to objects the strike.• That cathode rays are deflected by electric fields and magnets.

Dmitri Mendeleev

Feb 8, 1843

• Arranged elements into seven groups.• Discovered properties of the elements.• Made the periodic law.

John Dalton

Nov 3, 1844

• Dalton Was a More modern scientist • Created the symbols to represent atom and its properties. • He is the creator of Daltons Law.

Hantaro Nagaoka

Aug 15, 1865

Otto Hahn

Mar 8, 1879

• Discovered another way to make atoms smaller but not being able to destroy it.• He discovered the method when uranium is smashed with neutrons it makes smaller nuclei
• And discovered another way to split the atom.

Hans Geiger

Sep 30, 1882

• Along with Rutherford he conducted the experiment to count how many particles can pass through the gold sheet.• This experiment lead to the device; the Geiger counter.• He also discovered the atomic nucleus.

James chadwick

Apr 20, 1891

• Dicsoverd the neutron that has a lack of electric charge.• This is one of the biggest things im the atomic theory now.• And has help tremendously for everyone to understand the atom.

Niels Bohr

Feb 15, 1913

• His Theory was that Electrons have a stationary path that they orbit around.• This was applied to the rutherford’s atomic structure.• This led to being able to calculate energy levels.

Ernest Rutherford

Nov 3, 1937

• Discovered the nucleus inside the atom that is in the middle surround but negative electrons.• He come up with the experiment to find how many particles will pass through a gold sheet and deceting them.• Only 1 in 8000 past through the rest were deflected.

J.J Thomson

Nov 3, 1940

• He discovered the electron is the component of all matter.• Made a formual to calculate the mass ratio for the electron.• Found a much smaller particle in the atom.• Found a much smaller atom, hydrogen.• Found the particle now known as a electron

Arostotile

Mar 2, 2022

• Aristotle was an ancient Greek philosopher,• Was one of the first to study the atom.• Believes there is an endless number that you can cu an atom.