The Niels Bohr Atomic Theory

Intellectual greetings. Well this time I post material high school chemistry as a continuation of my previous post that E.Ruterford Atomic Theory as a further material which I promised that Neils Bohr Atomic Theory, like apasih Neils Bohr atomic theory? To know the answer, please read and understand the following explanation:

In 1913, Niels Bohr expressed the opinion that the electrons move around the nucleus in certain trajectories, called shells.

"Bohr stated that electrons only occupy certain orbits around the nucleus of atoms, each of which is related to a number of energy-multiples of a basic quantum value. (John Gribbin, 2002) "

Bohr Atom Model
Bohr model of the hydrogen atom describe the negatively charged electrons orbiting the atomic shell in a certain trajectory around the positively charged atomic nucleus. When the electrons jump from one orbit to another orbit always accompanied by emission or absorption amount of electromagnetic energy hf.

According to Bohr:
"There are rules of quantum physics that allow only a certain number of electrons in each orbit. There is only room for two electrons in orbit nearest the core. (John Gribbin, 2005) "

Bohr model of the hydrogen atom describe the negatively charged electrons orbiting the atomic shell in a certain trajectory around the positively charged atomic nucleus. When the electrons jump from one orbit to another orbit always accompanied by emission or absorption amount of electromagnetic energy hf.

This model is the development of the plum pudding model (1904), the model Saturnian (1904), and the Rutherford model (1911). Because the Bohr model is the development of the Rutherford model, many sources combine the two names in penyebutannya into the Rutherford-Bohr models.

This model is the key to success in explaining the Rydberg formula of the spectral emission lines of hydrogen atoms, although Rydberg formula already known experimentally, but never get the theoretical foundation before the Bohr model was introduced. Not only because of the Bohr model describes the rationale for the structure of the Rydberg formula, it also gives the results of empirical justification in terms of the tribes of the fundamental physical constants.

Bohr model is a primitive model of the hydrogen atom. As a theory, the Bohr model can be considered as a first order approximation of the hydrogen atom using quantum mechanics are more general and accurate, and thus can be considered as a model that has been worn out. However, because of its simplicity, and the result is right for a particular system, the Bohr model still taught as an introduction to quantum mechanics.

The weakness of the atomic theory of Rutherford repaired by Neils Bohr, namely:

a. The electrons surrounding the nucleus has a certain trajectory and energy.

b. In particular orbital, the electron energy is fixed. Electrons will absorb energy if moving to a more external orbit and will liberate energy if moving deeper into orbit

Excess Bohr model of the atom
Atom consists of several leather / subshells for a transfer of electrons and atoms form an orbit in which atomic nuclei are positive and there surrounding electrons.

The weakness of the Bohr atomic model
a. Unable to explain the Zeeman effect and effect Strack.
b. Unable to explain the events in a chemical bond with the good, the influence of the magnetic field of the atoms, and the atoms are electron spectrum more.

Now that that's the explanation of Neils Bohr atomic theory may be useful. But this theory is not perfect because it still has weaknesses, so to find further explanation about the atomic theory, you can see it in the next article. ookkeeyyyy

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