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| physical object > natural object > particle > charged particle > electron > bound electron > K electron | 
| K electron comparison table | |||
| Subject | is a kind of | has energy quantum number | has definition | 
|---|---|---|---|
| bound electron | electron | Zone in which the electron in atoms reside. Its radius is determined by the quantum principle, its population by the exclusion principle. | |
| K electron | bound 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. | 
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