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bound electron comparison table

Subject	has energy quantum number	has definition	has orbital quantum number
d-electron		An orbital electron whose l quantum number is 2.	2
f-electron		An orbital electron whose l quantum number is 3.	3
K electron	1	An electron in the K shell, the innermost shell, or energy level, of an atom. All elements heavier than hydrogen have a filled K shell, which consists of two 1s electrons orbiting the nucleus.
p-electron		An orbital electron whose l quantum number is 1.	1
s-electron		An orbital electron whose l quantum number is zero.	0

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