Rutherford made the first rudimentary model of the atom in (1907)
The first workable model of Hydrogen atom was by Niels Bohr (1913). It was based on emmulating the motion of the solar system.
The electron was discovered in 1897.The Neutron was discovered in 1932 by J. Chadwick.
The Einstein theory of relativity was publised by Einstein in 1905 before it was even known that the atom had a Nucleous.
Henri Poincare published the famous equation"E=M C^2 in 1901.
The first atomic bomb dropped on humans was in 1945.
The mass of atoms is measured in atomic mass units.
One atomic mass units is = one kilogram mass divided by Loschsmidt's number.
The of mass atoms was compiled from the Periodic table of elements(delevopped by D. Mendelev in 1871), by relative comparison of masses the mass of the hydrogen atom was determined. So it was realy mendelev that was responsible for comparatively.measuring atomic masses.
The weight of an atom is measured as the poduct of mass Units and acceleration of the celestial body where they exist.
2007-08-22 08:18:19
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answer #1
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answered by goring 6
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well we know an atom weight is given by the number of the protons and neutrons ..............
Ernest Rutherford was born near Nelson, New Zealand in 1871. In 1895 he left for Cambridge University, England to conduct research on new ways of detecting radio signals. He was hoping to obtain a patent on the results of this work and to use money obtained from patent royalties to bring his fiancee to England from New Zealand. However, Lord Kelvin a famous physicist , persuaded Rutherford that there would be little use for radio, except by lighthouse operators. Instead, Kelvin recommended that Rutherford should study the phenomenon of radioactivity.This idea interested Rutherford. He began his studies on radioactivity by investigating X-rays.
Rutherford successfully applied for a degree in physics at McGill University. At McGill, Rutherford spent much of his time studying alpha-particles and became convinced that they were, in fact, the nuclei of helium atoms.
Rutherford's most important work at McGill was the development of the theory that rays were emitted by an element when it changed into a new, different element. This proposal, which some scientists called "The new alchemy", was surprisingly well received when one remembers that, all that time, chemistry was based on the belief that one chemical element could not be changed into another. Ritherford's new discoveries and ideas brought him fame, including the Nobel prize for chemistry, and a steady stream of research students .
In 1907 Rutherford was lured to the University of Manchester, where, in its new, well equipped laboratories, he and his co-workers conducted the experiments that led to the modern model of the atom.
so i guess it'r true.
2007-08-22 14:06:12
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answer #2
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answered by linglong 2
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