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400
democritis
his hypothesis was that matter is made of individual particles called atoms
called 'father of modern science' -
john dalton
his hypothesis was that matter was made up of sphyrical solid masses i n motion -
J. plucker
he built one of the first gas discharge tubes (cathode ray tube). -
cathode ray tube
Johann Hittort invented the cathode ray after J. Pluckers discoveries -
wilhelm roentgen
using a CRT he realized that nearby chemicals glowed. More experiments found very penetrating rays coming from the CRT that were not deflected by a magnetic field. He named them "X-rays". -
wilhelm roentgen
the first x-ray was made from roentgens earlier discoveries -
jj thomson
described the atom as a ball of positice charge containing a number of electrons -
ernest rutherford
used his 'gold foil' experiment to determine that the nucleous of the atom is very denceand had a positice charge. Thus discovering the proton -
neils bohr
explained the atomic structure of the atom as 'sucessive orbital shells of electrons'
model is known as the bohr planetary model -
schrodinger
he and de broglie identified the electron cloud model as the probable location of moving electrons -
cockroft and walton
figured out that you could split the atom -
chadwick
discovered a particle within the nucleous that has a mass similar to that of a proton
thus he is credited with discovering the neutron -
openheimer
used cockroft and waltons theory to make the atomic bomb which was dropped on august 6 in japan -
willhelm roentgen
Using a CRT he observed that nearby chemicals glowed. Further experiments found very penetrating rays coming from the CRT that were not deflected by a magnetic field. He named them "X-rays".
