Solar system model

Each element has its own line spectrum. This is why the line spectrum for an element is also considered to be a fingerprint for that particular element. Because the amounts of light given off by the excited atoms were in fixed amounts, Bohr termed them quantized amounts of light. These fixed amounts of energy proved that the electrons could only make certain jumps between the orbits that were at fixed distances in the atom. Because of these fixed, circular orbits, Bohr s model of the atom is often referred to as the solar system model of the atom (see Figure 3.4). 

It is interesting to note that straightforward Bohr-Sommerfeld quantization of the action (6.1.11) yields the exact result (6.1.25) for the bound state energies. In our units the Bohr-Sommerfeld condition results in / = n, n = 1,2,. Inserting this result into (6.1.13) indeed reproduces (6.1.25) exactly. This is the same happy accident which allowed Bohr (1913) to obtain the Balmer formula from a simple solar system model of a one-electron atom. 

Why is the Bohr model of the hydrogen atom referred to as the solar system model ... 

Scientists have known for a long time that it is incorrect to think of electrons as tiny particles orbiting the nucleus like planets around the sun. Nevertheless, nonscientists have become used to picturing them in this way. In some circumstances, this solar system model of the atom may be useful, but you should know that the electron is much more unusual than that model suggests. The electron is extremely tiny, and modern physics tells us that strange things happen in the realm of the very, very small. 

A) Two-dimensional Bohr solar system model of the atom depicting the first five orbits (n = 1 -5) B) three-dimensional equivalent of the Bohr model of the atom... 

Bohr model solar-system model of the atom electrons in specific orbits around the nucleus... 

Since hydrogen cyanide and ammonia are two of the most important parent compounds present in comets and since these bodies are intensely irradiated when they pass througih their closest proximity to the Sun, it is not unreasonable to think that some of the organic compounds described above may also be found in comets. The chemical composition of these bodies is considered to be representative of the composition of the solar nebula from which the primitive earth was formed. Therefore, it offers a solar-system model for studies on prebiological chemistry.< >... 

Two other models for the atom are important. One was proposed by a Danish scientist by the name of Neils Bohr in 1913. This model was called the solar system model because he proposed that the electrons orbit the nucleus much like the planets orbit the sun. The other was proposed by Austrian physicist Erwin Schrodinger in 1926. The Schrodinger model is called the quantum mechanical model and is the model that we use today to explain and predict atomic behavior. Each of these two models is explained more fully in the sections that follow. A summary of the history of the development of atomic theory is given in Table 4.1... 

James Chadwick won the Nobel Prize in physics in 1935 for his discovery of the neutron, t Neils Bohr won the Nobel Prize in physics in 1922 for his solar system model. 

Discovery and characteristics Plum pudding model Nuclear model Solar system model Quantum mechanical model... 

Solar system model—c Nuclear atom—e Original atomic theory—b Quantum mechanical model—a Plum pudding model—d Neutron—g... 

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