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John Dalton
Name - John Dalton
Year/s he worked - 1803
Nationality - English
His contributions - Introducing the atomic theory to chemistry -
Period: to
Atomic Theory
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Marie Curie
Name - Marie Curie
Year/s worked - 1893
Nationality - French+polish
Contribution - discovery of radium and polonium -
Henri becquerel
Name - Henri becquerel
year/s worked - 1896
Nationality - French
His contribution - discovery of spontaneous radioactivity -
JJ Thomson
Name - Joseph john Thomson
year/s He worked - 1897
Nationality - Scottish
His contribution - experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons -
Fredrick Soddy
Name - Fredrick Soddy
Year/s He worked - 1903-04
His nationality - British
His contribution - discovered that all radioactive preparations were not unique elements, but rather that some of them were variants of known elements. -
Ernest Rutherford
Name - Ernest Rutherford
Years he worked - 1907
Nationality - New zealand
Contribution - He found that the atom is mostly empty space, with almost all its mass concentrated at the central nucleas. -
Erwin shcrödinger
Name - Erwin shcrödinger
Year/s He worked - 1926
Nationality - Austrian
His contribution - used mathematical equations to describe the likelihood of finding an electron in a certain position. -
James chadwick
Name - James Chadwick
Year/s He worked - 1943-46
Nationality - British
His contribution - He proved the existence of neutrons – elementary particles devoid of any electrical charge.