Question Video: Identifying the Letter That Is Not Used to Represent an Energy Level Science

Which of the following letters is not used to represent an energy level? [A] I [B] K [C] L [D] M [E] N

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Video Transcript

Which of the following letters is not used to represent an energy level? (A) I, (B) K, (C) L, (D) M, or (E) N.

Energy levels are regions around the nucleus in which electrons move according to their energies. The first energy level is referred to as energy level K, and it can hold a maximum of two electrons. Electrons fill energy level K first. The second energy level is L, and it can hold a maximum of eight electrons. The third energy level is energy level M. It holds a maximum of 18 electrons. N is the fourth energy level. It holds a maximum of 32 electrons.

Therefore, K, L, M, and N are all letters used to represent energy levels. Atoms can contain more energy levels beyond these four. But we can already see that four of the five answer choices do represent an energy level.

Thus, of the letters given in the answer choices, the one that’s not used to represent an energy level is I, or answer choice (A).

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