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I need to get a nice picture about how electron moves around nucleus? I find concept of probability and orbitals quite difficult to understand?

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hi ashok, glad to see you here. I am in other sites of stackexchange. Hope u and our friends from the department may find physics.stackexchange useful. All the best! –  Rodrigues Jan 14 '11 at 20:54
    
See this link for visualization: daugerresearch.com/orbitals/index.shtml –  Murod Abdukhakimov Apr 10 '12 at 7:11

2 Answers 2

Dear Ashok, it is an experimentally established fact that the motion of electrons inside atoms requires us to speak about the probabilistic distributions - and wave functions whose absolute value has to be squared to obtain the probability density. The equation for the wave functions is known and nicely enough, its solutions - the orbitals - can be drawn. This is much more "user-friendly" a situation than in many other portions of physics in which the objects can't be even drawn.

Before quantum mechanics was born, Niels Bohr had a simpler model of the Hydrogen atom that was similar to the Solar System: the electrons were just rotating along circles. He postulated that the circumference of the circle couldn't have been arbitrary but had to satisfy a "discrete" condition. This captured many properties of the Hydrogen atom but wasn't right in details: the details require quantum mechanics and the probabilistic language.

You're not the only one who has problems with it - many people, including famous physicists (not to speak about thousands of not so famous physicists today, and many physics fans), didn't want to accept the probabilistic description as fundamental. They thought there had to exist a more "understandable" description, similar to classical physics. However, these people - including Einstein - have been proved wrong.

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thanks for a quite descriptive answer, and i am relieved to know i am not only the one who has problems with the present concepts i am taught !! –  ashok Jan 14 '11 at 16:13

I find Wikipedia explanation quite explicit: an atomic orbital is a mathematical function that describes the wave-like behavior of either one electron or a pair of electrons in an atom. This function can be used to calculate the probability of finding any electron of an atom in any specific region around the atom's nucleus.

Actually, nobody "knows" what the electron does around the nucleus, but what we know is that the absolute value of the wave function is the probability density that the electron can be found in that point of space. Plot it and you get the nice pictures of the orbitals. Otherwise, the concept of "movement" is a classical one that you cannot extend directly to small scales.

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thank you , i am new to thic community and find very interesting here ! The concept of probability just confuses me, i will try to realise that i can not escape it if i want to understand it !! –  ashok Jan 14 '11 at 16:12
    
I'd add one thing to the excellent answers above. There is no evidence that anything is moving at all in an atom. The reason is that according to Maxwell's equations, any charged body that is subject to an acceleration must radiate energy. We don't see this happening under ordinary conditions. This rules out electrons as particles in atoms. But we can have a standing wave (one whose nodes do not move). And yes, I know, this makes visualization worse... –  Paul J. Gans Nov 28 '12 at 1:04

protected by Qmechanic May 26 '13 at 0:14

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