chemsirty test
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Robert Millikan | Oil Drop Experiment
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| james chadwicks | .James Chadwick discovered the neutron in 1932
Chadwick helped Rutherford in making studies of the properties and the structures of
.accomplished the transmutation of other light elements
.Chadwick researched the ionization of phosphorous and the photo
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| John Dalton | 1.Elements are made of extremely small particles called atoms.
2.Atoms of a given element are identical in size, mass, and other properties; atoms of different
3.Atoms cannot be subdivided, created, or destroyed.
4.Atoms of different elements combine i
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| Niels Bohr | - Bohr atom model: All electrons circle the nucleus on a specific orbit. As an atom absorbs
energy, electrons move to an orbit further away from the nucleus. As the atom releases energy,
electrons move closer to the nucleus.
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| Werner Heisenberg | The discovery of the Uncertainty Principle was first made when Heisenberg noticed, through
the research of other scientists, that there were always small errors when both the place and
speed of a particle were measured at the same time.
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| Dimitri Mendeleev | proposed the periodic law and developed the first periodic table in 1869. Medeleev's table was arranged according to increasing atomic weight and left holes for elements that were yet to be discovered.
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| J. J. Thomson | identified the negatively charged electron in the cathode ray tube in 1897. He deduced that the electron was a component of all matter and calculated the charge to mass ratio for the electron.
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