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i need to find a picture of Bohrs planetary model of the atom. where would i find this?
- Rose (age 15)
Bohr's planetary model of the atom had all of the
protons and neutrons clustered together in a nucleus at the center of
the atom (like most scientists still believe that they are). Then it
had the electrons moving around the nucleus in eliptical (oval-shaped)
paths, or 'orbits'. The reason that it's called a 'planetary model' is
that the electrons move around the nucleus much like the planets move
around the sun (except that the planets are held near the sun by
gravity, whereas the electrons are held near the nucleus by something
called a Coulomb force). The model atom basically looked like this:
reason that Bohr came up with this model had to do with the ways that
different atoms can absorb or emit certain colors of light. It did a
decent job of predicting these colors for the hydrogen atom, although
with some errors. It was nearly useless for other atoms, and failed to
capture most properties of atoms and molecules at all. A model is one
where the electrons move around the nucleus in something more like a
cloud. For a picture of this, and another picture of a Bohr planetary
model atom, check out the answer to the question Picture of an Atom
(republished on 07/21/06)
Follow-up on this answer.