Answer:
they can exist in B electron clouds or energy levels
Explanation:
Electrons can exist in electron clouds or energy levels states, therefore option (b) is correct.
An electron cloud is the region of negative charge surrounding an atomic nucleus that is associated with an atomic orbital.
Energy levels are nothing but the fixed distances of electrons from the nucleus of an atom. The energy levels are also called electron shells.
An electron can move in one energy level or to another energy level, but it can not stay in between two energy levels.
Electrons can exist in electron clouds or energy levels states, hence option (b) is correct.
Learn more about electron cloud and energy levels ,here:
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