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I'm sure this has a straightforward explanation and am hoping someone can answer it for me.

Looking at this diagram of Bohr's quantified shell model of the atom:

http://library.thinkquest.org/C005775/Theory/oldtheory_section3.html

...I don't understand what is preventing the electron from colliding with the nucleus after n=1, since it still has one unit of energy left, and each previous orbit only required one unit of energy to move it to the next smaller orbit.

Thanks.

Looking at this diagram of Bohr's quantified shell model of the atom:

http://library.thinkquest.org/C005775/Theory/oldtheory_section3.html

...I don't understand what is preventing the electron from colliding with the nucleus after n=1, since it still has one unit of energy left, and each previous orbit only required one unit of energy to move it to the next smaller orbit.

Thanks.

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