What is the name of the innermost shell of an atom?

Name: What is the name of the innermost shell of an atom?
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The innermost shell of an atom is called the K shell. This is because it is closest to the nucleus, which is represented by the letter 'K' in the atomic shell model. The letter 'A' does not refer specifically to the innermost shell, 'Z' is not used in the atomic shell model and 'nuclear shell' refers to the arrangement of protons and neutrons in the nucleus, not the electron shells.

What Is the Name of the Innermost Shell of an Atom