Below are listed some major contributions to the development of atomic theory. I
ID: 946520 • Letter: B
Question
Below are listed some major contributions to the development of atomic theory. Identify the scientist associated with each contribution by dragging his name to the blank next to his contribution. (Not all names will be used, and some names will be used more than once.) discovered the electron. He discovered periodic changes in properties of elements when they are listed in order of their atomic weights. He experimented with the deflection of cathode rays by a magnetic field. He carried out experiments that measured the scattering of alpha particles by heavy atoms. His model of the hydrogen atom led to an accurate calculation of the wavelengths of light emitted by an excited hydrogen atom. He proposed the planetary model of the atom with most of the mass of the atom concentrated in a very small nucleus. He modified the planetary model of the atom by suggesting electrons could travel about the nucleus in only a few discrete stable orbits.Explanation / Answer
(1) J.J.Thomson discovered the electron.
(2) Dmitri Mendeleev discovered periodic changes in properties of elements when they are listed in order of their atomic weights.
(3) J.J.Thomson experimented with the deflection of cathode rays by a magnetic filed.
(4) Ernest Rutherford carried out experiments that measured the scattering of alpha particles by heavy atoms.
(5) Niels Bohr model of hydrogen atom led to an accurate calculation of the wavelengths of light emitted by an excited hydrogen atom.
(6) Ernest Rutherford proposed the planetary model of the atom with most of the mass of the atom concentrated in a very small nucleus.
(7) Bohr modified the planetary model of the atom by suggesting electrons could travel about the nucleus in only a few discrete stable orbits.
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