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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: Mikez on May 27, 2008, 07:07:37 PM

Title: Bohr's Model of the Atom
Post by: Mikez on May 27, 2008, 07:07:37 PM

Where can I get some reliable information showing how Bohr's Model of the Atom helps explain nuclear structure. I am trying to get something specific that I can quote for a presentation, I've tried wiki but it talks only about Rutherford when discussion nuclear structure.

Also is it true that bohr's model of the atom can be drawn without a nucleus? (teacher stated it today but it didn't make any sense to me)

Thanks

Title: Re: Bohr's Model of the Atom
Post by: enahs on May 27, 2008, 07:30:41 PM

Not listed in any specific order:
http://hyperphysics.phy-astr.gsu.edu/hbase/Bohr.html
http://www.upscale.utoronto.ca/GeneralInterest/Harrison/BohrModel/BohrModel.html
http://csep10.phys.utk.edu/astr162/lect/light/bohr.html

Title: Re: Bohr's Model of the Atom
Post by: cliverlong on May 28, 2008, 03:22:14 AM

Nice links enahs, Thanks

Something I have never understood ...

The transition of electrons between energy levels is due to absorption or emission of em quanta of specific energy and hence specific frequency. Say that frequency corresponds to light in the visible spectrum, then why do we see absorption or emission spectra? If the change to a higher level can only come from absorbing a quanta of a very specific energy and colour, then that can only come from light itself. What I'm trying to get at, if we have a flame test of a group 1 or group 2 metal then where is the energy coming from to cause the excitation of the electrons? The obvious answer is the heat in the flame. But won't this heat be of the wrong energy, since only visible light will cause the electron to "jump" to a higher level? To cause an electron transition we would have light in, light out, we wouldn't see anything.

What am I not understanding?


Thanks

Clive

Title: Re: Bohr's Model of the Atom
Post by: Mitch on May 28, 2008, 03:35:24 AM

The Bohr model is meant to explain atomic structure not nuclear. Although, some assumptions like the nucleus is in the center of well defined electron orbitals are implicit in the model.

Title: Re: Bohr's Model of the Atom
Post by: cliverlong on May 28, 2008, 03:50:27 AM

Quote from: Mitch on May 28, 2008, 03:35:24 AM

The Bohr model is meant to explain atomic structure not nuclear.

Good point - I completely missed that.

Quote

Although, some assumptions like the nucleus is in the center of well defined electron orbitals are implicit in the model.

Thanks

Clive

Title: Re: Bohr's Model of the Atom
Post by: Astrokel on May 28, 2008, 08:06:07 AM

Quote from: cliverlong on May 28, 2008, 03:22:14 AM

The obvious answer is the heat in the flame. But won't this heat be of the wrong energy, since only visible light will cause the electron to "jump" to a higher level? To cause an electron transition we would have light in, light out, we wouldn't see anything.

Thermal excitation is possible to promote an electron to excited states. It does not have to be photon colliding with electron, other possible way is through external electron colliding with atom's electron.