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K electron comparison table
Subject is a kind of has energy quantum number has definition
bound electronelectron Zone in which the electron in atoms reside. Its radius is determined by the quantum principle, its population by the exclusion principle.
K electronbound electron1An 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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