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1900 BCE
Alchemy
All matter was composed of four elements: earth, air, fire and water. -
1900 BCE
Alchemy
This included precious metals as well as elixirs to cure disease and prolong life. -
1900 BCE
Alchemy
With the right combination of elements, it was theorized, any substance on earth might be formed. -
490 BCE
Democritus
Democritus was the first to identify the possibility of an atom, which would be the smallest piece of matter -
490 BCE
Democritus
Democritus believed that atoms are indivisible, all are exactly alike, and that all matter is made up of atoms. -
490 BCE
Democritus
Democritus theory stated: Atoms cannot be erased or deleted from existence, merely changed. Atoms are able to generate anything any size or composite. -
John Dalton
Born colour blind in Eaglesfield, England. -
John Dalton
Dalton was accepted into the manchester's literary and philosophical society. -
Daltons Law
In 1803 John revealed his concept of the daltons law -
Atomic Theory
Developed modern atomic theory -
John Dalton
Passes away at 78 years old -
Henri Becquerel
Born in Paris, France -
J.J Thompson
J.J. Thomson was born in Cheetham Hill, England -
Pierre Curie
Born in Paris France -
Marie Curie
Born in Warsaw, Poland -
Owens College
Attended Owens college at the age of 14 -
Ernest Rutherford
Born in Spring Grove, New Zealand. -
Trinity college
Thompson entered the college as a minor -
Neils Bohr
Born in Copenhagen, Denmark -
Ernest University
At the age of 18 he left for the city of Christchurch, where he had won a scholarship to Canterbury College, now the University of Canterbury. -
J Chadwick
Born in Bollington, United Kingdom -
Pierre Gets his Doctor of Science Degree
Pierre gets his doctor of science degree. -
Henri
Becquerel thought that phosphorescent materials, such as some uranium salts, might emit penetrating X-ray-like radiation when illuminated by bright sunlight. -
Henri
After other experiments involving non-phosphorescent uranium salts, he arrived at the correct explanation, namely that the penetrating radiation came from the uranium itself, without any need for excitation by an external energy source. -
Radioactivity
Henri Becquerel discovers radioactivity -
J.J. Thomson discovered the electron.
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Rutherford discovers two types of rays.
discovered rays from radioactive materials, which he named Alpha and Beta. -
New Element
Marie Curie and her husdand created a new element called Polonium. -
Radium
Curies announced the existence of a second element, which they named "radium." -
Rutherford discovered a radioactive gas.
Ernest Rutherford discovered a radioactive gas called Radon today. -
Henris Discovery
Another discovery was the circumstance that the allegedly active substance in uranium, uranium X, lost its radiating ability in time, -
Noble Prize
Becquerel shared the Nobel Prize in Physics with Pierre and Marie Skłodowska-Curie -
Thompson's discovery of matter
discovered all matter is made up of tiny particles -
Thompson's receives Noble Prize
Discovery of the electron. -
Pierre Currie
Passed away at the age of 47 -
Noble Prize
Rutherford was awarded the 1908 Nobel Prize in Chemistry for his theory of atomic structure. -
Henri Becquerel
Passed away at the age of 56 -
Rutherford discovers Protons
Ernest Rutherford discovers protons -
Chadwick's Discovery of a Neutron
-
Marie Curie
Passed away at the age of 67 -
Noble Prize
James Chadwick won a noble prize for his discovery of the neutron and the tributes it made to the Atomic Theory. -
Ernest Rutherford
Passed away at the age of 66 -
J.J Thompson
Passed away at the age of 84 -
International Atomic Energy Agency
Neils Bohr's ideas and work helps the International Atomic Energy Agency. -
Atoms for Peace Award
Neils Bohr was given the Atoms for Peace Award in 1957. -
Neils Bohr
Passed away at the age of 77 -
J Chadwick
Passed away at the age of 83
