The Bohr Model

[whathashizzyDDS]

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I am having trouble understanding the general concept of the bohr model. I got a question from Kaplan and part of the explanation goes "Bohr model only pertains to atoms or ion containing ONE electron"...

1. What the **** does that mean? just hydrogen?
2. What is the concept of bohr model?

THANKS IN ADVANCE! 🙂

 

[UndergradGuy7]

Just hydrogen or I think Helium ion.

It was the first model and it explained 1 electron atoms good, but did not explain other atoms. This is because it did not take into account the repulsions of other electrons. Model just says electrons spin around the nucleus in a set path "orbit." This is not true since electrons are found randomly in clouds around a nucleus.

The present model is the quantum mechanical model.

 

[omarbasha]

I am having trouble understanding the general concept of the bohr model. I got a question from Kaplan and part of the explanation goes "Bohr model only pertains to atoms or ion containing ONE electron"...

1. What the **** does that mean? just hydrogen?
2. What is the concept of bohr model?

THANKS IN ADVANCE! 🙂

All of Bohr's model is pretaining to the Hydrogen atom, Bohr assumed that the hydrogen nucleus consisted of a central proton around which an electron travelled in a circular orbit, and that the centripetal force acting on the electron as it revolved around the nucleus was the electrical force between the positively charged proton and the negatively charged electron 😀

 

[rnbaxter]

I am having trouble understanding the general concept of the bohr model. I got a question from Kaplan and part of the explanation goes "Bohr model only pertains to atoms or ion containing ONE electron"...

1. What the **** does that mean? just hydrogen?
2. What is the concept of bohr model?

THANKS IN ADVANCE! 🙂

I believe it is talking about how hydrogen has 1 electron. This electron can be in 1 of many orbits. The closer to the nucleus the electron is the lower energy it contains. If you had energy it can excite the electron and raise it to a further distance away from the nucleus. And when the electron releases energy in the form of light it returns to its ground state. It was just his theory in the early 1900s.

 

[nze82]

I am having trouble understanding the general concept of the bohr model. I got a question from Kaplan and part of the explanation goes "Bohr model only pertains to atoms or ion containing ONE electron"...

1. What the **** does that mean? just hydrogen?
2. What is the concept of bohr model?

THANKS IN ADVANCE! 🙂

Yes! The Bohr model specifically talks about the Hydrogen atom.
The general idea is that an electron can orbit the nucleus at set distances, known as energy levels. The closer the electron; the lower its energy content. Why? Because the "Nuclear Pull" [The attractive force between the negative charge of the electron and the positive charge of the nucleus] is stronger on the electron that is closer to the nucleus. Subsequently, such an electron has less "freedom" to move, and therefore has a lower energy content. The farther we move from the nucleus, the weaker the nuclear pull becomes, giving the electron greater freedom to move. Therefore, the energy content of the electron will increase.
Now, when an electron from a lower energy level (one closer to the nucleus) wants to move to a higher energy level (one farther from the nucleus) it must gain energy to overcome the nuclear pull. This energy is absorbed in form of a light with a specific wavelength. This is the excited state of the electron.
On the other hand, when the electron "falls" from a higher energy level to a lower energy level, it releases it's energy in form of a light with a specific wavelength that corresponds to the amount of released energy. This is the ground state of the electron.

Hope this helps!

 

[mashinka]

nze82, suuuuper helpful explanation. I was struggling with the same concept myself. Your thorough explanation involves the idea of the quantum mechanics model, right. Or am I just still confused?

 

[nze82]

nze82, suuuuper helpful explanation. I was struggling with the same concept myself. Your thorough explanation involves the idea of the quantum mechanics model, right. Or am I just still confused?

Well, like we established before, the Bohr model only deals with the Hydrogen atom. The quantum theory takes the Bohr model one step farther, trying to explain the most probable location of electrons (Energy shells, Energy sub-shells, Orbitals, etc.) around the nucleus of various atoms by using the quantum numbers. For example, the principle quantum number "n" refers to a specific energy level surrounding the nucleus. This is the same energy level that was discussed in the Bohr model. But the quantum theory now goes one step further to explain which types of orbitals can be found within this particular energy level by using the quantum number "l." Furthermore, it explains the orientation of a specific orbital in space by using the quantum number "ml," and finally it determines the spin of the electrons within a given orbital by using quantum number "ms." Essentially, it helps to give a more detailed explanation of the behavior of the electron around the nucleus.