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460 BCE
Democritus
First proposed the existence of an ultimate particle. Used the word "atomos" to describe this particle. -
460 BCE
Democritus
First proposed the existence of an ultimate particle. Used the word "atomos" to describe this particle. -
Antoine Lavoisier
He contributed by naming oxygen.He also composed the Law of Conversation of mass -
Michael Faraday
Michael Faraday FRS was an English scientist who contributed to the study of electromagnetism and electrochemistry -
Joseph Louis Proust
He first published his Law of Definite Proportions (or Law of Constant Composition) in 1794. This law states that a compound is composed of exact proportions of elements by mass regardless of how the compound was created -
John Dalton
He is best known for proposing the modern atomic theory, and for his research into colour blindness.Proposed that all matter was composed of atoms, indivisible and indestructible building blocks. -
Henri Becquerel
He discovered the existence of radioactivity. This is a very common treatment for a variety of medical conditions, and it harnesses the power of radioactivity. -
J.J. Thomson
Thomson identified the negatively charged electron . Deduced that the electron was a component of all matter and calculated the charge to mass ratio for the electron. -
Marie & Pierre Curie
Pierre and Marie Curie are best known for their pioneering work in the study of radioactivity, which led to their discovery in 1898 of the elements radium and polonium. -
Albert Einstein
treated matter and energy as exchangeable. Albert Einstein became famous for the theory of relativity, which laid the basis for the release of atomic energy. -
Ernest Rutherford
proposed the nuclear atom as the result of the gold-foil experiment in .This was a very radical proposal that flew in the face of Newtonian Physics. -
Neils Bohr
proposed a theory for the hydrogen atom based on quantum theory that energy is transferred only in certain well defined quantities -
Max Planck
a German physicist, is best known as the originator of the quantum theory of energy for which he was awarded the Nobel Prize in 1918. -
Robert Millikan
an American experimental physicist honored with the Nobel Prize for Physics -
James Chadwick
He discovered the neutrons in atoms . bombarded beryllium atoms with alpha particles. An unknown radiation was produced.