Each probability cloud in an atom can be occupied by
A)only one electron.
B)two electrons with spins in the same direction.
C)two electrons with spins in opposite directions.
D)any number of electrons.

Question

Quizplus · Accepted Answer

The Pauli exclusion principle states that no two electrons in an atom can have the same set of four quantum numbers. Therefore, in order to occupy the same probability cloud, the electrons must have opposite spins. Therefore, choice C is correct. Choices A and B are incorrect because only one electron can occupy each probability cloud, and if two electrons occupy the same cloud, they must have opposite spins. Choice D is incorrect because there are a limited number of probability clouds in an atom, and each can only be occupied by a limited number of electrons.

Each Probability Cloud in an Atom Can Be Occupied by