11 jan 1913 ano - Niels Bohr
Descrição:
Summary: Bohr fixes the problem of the instability of the Rutherford model by changing the way electrons orbit the nucleus.
What did he use to figure this out? What did this say?:
Bohr used quantum theory to prove that Rutherford's model was implausible, if not impossible, as, if the electrons were orbiting the nucleus in this way, they would eventually lose energy and plummet straight into the nucleus. Bohr instead proposed that electrons in the shell that are closer to the nucleus have less energy than those further away from the nucleus.
Also, he believed that electrons existed in a cycle of excitement and de-excitement. He observed that, when subjected to heat, electrons would absorb the energy and move up to the shell further away from the nucleus. Then, they would release that energy in an observable flash of light, thus returning to the lower energy level of the shell it belonged in. The place where the electron has the least amount of energy it can have is called its " ground state".
What change has been made from Rutherford's model?:
The Electron shell configuration.
Why is this important?:
It improved the stabillity of the atom.
References:
Atomic Structure: The Bohr Model - dummies. (2018). dummies. Retrieved 12 February 2018, from http://www.dummies.com/education/science/chemistry/atomic-structure-the-bohr-model/
Adicionado na linha do tempo:
History of the atom
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