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Thursday, September 18, 2008

The Glazing Atomic Models from different Scientists

Ernest Rutherford

A New Zealander,(1871-1937) later performed an experiment and concluded that an atom is mostly empty space. It has a tiny positive core, called nucleus. His model is known as ‘the nuclear model of the atom’ and is accepted model today. He used a very thin piece of gold with a stream of positively charged particles known as the alpha particles. He found that most of the alpha particles passed straight through the foil as though this was mostly empty space. A few of them bounced back and some were deflected. Rutherford concluded that an atom was made up of a very dense, positively charged nucleus surrounded by empty space in which the electrons could be found. His experiment known as Gold Foil or Alpha-Scattering Experiment.

Neil’s Bohr

A Danish nuclear model and theoretical physicist,(1885-1962), made a contribution to the knowledge of atomic structure. He believes that electrons in an atom exist in specific regions at various distances from the nucleus. He saw the atom as a miniature solar system with its nucleus as the sun and the electrons rotating around it as the planets that orbit around the sun. The electrons are arranged around the nucleus in what are called energy levels or shells. He explained that the orbit closest to the nucleus is the lowest or ground state while orbits that increasing distances have greater energy levels.

Sir James Chadwick

A British physicist,(1891-1974),discovered the third major subatomic particles- the neutron. This particle bears neither a positive nor a negative charged and has a mass. He confirmed that it was the neutron that he sought. The mass of the neutron was also found to be slightly greater than the mass of the proton.

Erwin Schrodinger

An Austrian physicist,( 1887-1961),published his most famous work, the equation that explains the movement of electrons in an atom. It contained extremely hard math and many could not comprehend it. This model basically describes a cloud-like region where the electron is likely to be found. He studies the application and statistical interpretation of wave mechanics, the mathematical character of the new statistics, and the relationship of these statistics to statistical thermodynamics. He also worked on problems of general relativity and cosmology and on a unified field theory.

For me, I was in favor of Bohr’s proposal because first and foremost I was impressed with his model of the atom and I’m very much agreed witnts that were stated. He really made a significant contribution to our learnings about atomic structure. He visualized the electrons as rotating in orbits around the nucleus like planets rotating around the sun. He emphasized clearly so that we can easily pictured out and can easily understand the true structure of atoms. His proposal is much accepted today and it is our modern understanding of the particulate nature of matter and atoms that electrons can be found in orbit.

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