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Niels Bohr and his Atomic Theory

How Niels Bohr said his Atomic Theory was like.
by

Jake Ness

on 31 October 2012

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Transcript of Niels Bohr and his Atomic Theory

Niels Bohr Atomic Theory Bohr's Atomic Model Niels Bohr Atomic Theory In 1913, Niels Bohr created a picture of the atom that was called the Bohr Model. Bohr proposed that electrons revolve around the nucleus. Within each orbit, each electron has a fixed amount of energy in it. An electron may jump from one orbit of high energy to another of low energy. Radiation is absorbed or emitted when an electron moves from one orbit to another. Bohr's Influence Background Information Niels Bohr was born on October 7, 1885 in Copenhagen, Denmark. He started studying Philosophy and Math in college.
Then he entered a physics contest and won. He became fascinated with Physics. Bohr's mentor was Ernest Rutherford who said that atoms were made up of a nucleus with electrons orbiting around it. Bohr expanded Rutherford's theory by defining the paths that electrons follow. Bohr also won the Nobel Prize in 1922 for his atomic model. He also was known to have worked on the Manhattan Project and later spoke out on the misuse of Atomic. Bohr died on November 16, 1962. He had an element named after him on the Periodic Table called Bohrium. How Did Bohr Discover His Atomic Model? Bohr studied the planetary model of an atom with his mentor, Ernest Rutherford. He noticed that there were some problems with Rutherford's model. Rutherford believed that electrons orbit a solar nucleus. However the electron would lose energy and collapse into the nucleus which means atoms would be unstable.

With Bohr's model, he was able to prove that electrons can orbit in a stable manner and keep a certain distance from the nucleus. Bohr's atomic model was widely accepted by many other scientists. He was awarded the Nobel Prize in Physics in 1922. He helped other scientists learn more about atomic structure and quantum mechanics. Bohr's model was a good beginning, but it only worked for hydrogen and other one electron atoms. Other scientists were able to enhance the model over the next 10 to 15 years. Atomic Model Changes Over the years the Atomic Model has made a few changes. Scientists have better data, technology, and materials to help them learn more about the Atomic Model. Scientists have shared their research with other scientists so that they can get information that they didn't know about. Contributions to the Change in the Atomic Theory

There have been many discoveries in the Atomic Theory over many years. In the Greek Era, Democritus was the first to believe that all matter was made up of atoms. In the early 1800s, John Dalton believed that all elements have their own atoms. In 1897, J.J. Thomson discovered electrons, and in 1914, Moseley discovered that the atomic number of an element is equal to the number of protons in the nucleus. In 1913, Bohr defined his atomic model in which electrons revolve in orbits around the nucleus. He made a great discovery which helped other scientists like Heisenberg and Chadwick make improvement on his model. Heisenberg studied the path electrons took as they orbited the nucleus, and Chadwick discovered neutrons. Today, scientists are continuing to discover new theories such as studying the electron cloud.
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