Atomic Spectra Scientists
William Crooke
Who designed the first cathode ray tube?
Leis Meiner
Who discovered Nuclear Fission?
Marie Curie
Who discovered Radium?
Eugen Goldstein
Who discovered positive particles by shooting electrons at hydrogen atoms in a cathode tube?
John Dalton
Who discovered that atoms of different elements look different?
John Dalton
Who discovered that elements are made of solid, indestructible atoms?
James Chadwick
Who discovered that the atom also possesses neutrons in the nucleus?
Ernest Rutherford
Who discovered that there were three basic types of radiation by placing a piece of uranium in a lead box, and splitting the radiation that was given off into three beams?
Henry Moseley
Who discovered the atomic number?
J.J. Thomson
Who discovered the electron using the cathode ray tube?
Ernest Rutherford
Who discovered the nucleus and said all positive charge was kept there?
William Roentgen
Who discovered the x-ray?
Neils Bohr
Who figured out that atoms can give off colored light, when they are hit with electricity?
Robert Millikan
Who figured out the exact charge and mass of an electron?
Ben Franklin
Who first discovered that matter could be charged positive or negative?
Erwin Schrodinger
Who predicted where the electron would be moving within each energy level?
Louis DeBroglie
Who proposed that like light, matter could also move in waves?
Albert Einstein
Who proved Max Planck's theory to be correct by conducting an experiment known as the photoelectric effect
Werner Heisenberg
Who said it was impossible to know the exact location of an electron, because observing it with light could cause it to move to an unknown location?
John Dalton
Who stated that elements always come together in multiple ratios — like carbon and oxygen can make C1O1 or CO2?
Max Planck
Who stated that substances do not absorb energy gradually, but instead absorb energy in definite amounts, or quanta?
J.J. Thomson
Who took all of the previously discovered information and put it together to make the Plum Pudding Model?
Henri Becquerel
Who was the first person to coin the term "radioactivity" or "radiation"?
Democritus
Who was the first person to come up with the idea that all matter, like you, me, trees, desks — are made of invisible particles called atoms?
William Crooke
Who was the first to observe negative particles in the cathode ray tube?
