Why do electron shells start at K?

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June 17, 2007 3:14AM

Electrons are ruled by laws of quantum mechanics, which

determine probabilities for finding electrons in any particular

spot around nucleus. What we call the K shell is only part of space

nearest the nucleus in which the probability for an electron's

being found is the biggest. In that shell, the energy of electrons

is the lowest, and that is why electrons will spend most time

there, because only two electrons can be in that position at the

same time, while the rest of them have to be placed in higher

shells. See the Web Links to the left of this answer for more about

how this naming convention began

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