What is the maximum number of electrons that can occupy a single atomic orbital?

What is the maximum number of electrons that can occupy a single atomic orbital?

• A. One
• B. Two
• C. Eight
• D. Four

Answer: (B)

A single atomic orbital can hold a maximum of two electrons, a principle derived from the Pauli Exclusion Principle. This principle states that no two electrons in an atom can have the same set of quantum numbers, which means that if an orbital is occupied by one electron, a second electron can only enter that same orbital if it has an opposite spin. Thus, in any given atomic orbital, one electron can have a spin of "up" while the other has a spin of "down," allowing them to coexist. This is why the correct answer to the question is that a single atomic orbital can hold a maximum of two electrons. The other options do not align with this fundamental concept of quantum mechanics.

A single atomic orbital can hold a maximum of two electrons, a principle derived from the Pauli Exclusion Principle. This principle states that no two electrons in an atom can have the same set of quantum numbers, which means that if an orbital is occupied by one electron, a second electron can only enter that same orbital if it has an opposite spin. Thus, in any given atomic orbital, one electron can have a spin of "up" while the other has a spin of "down," allowing them to coexist. This is why the correct answer to the question is that a single atomic orbital can hold a maximum of two electrons. The other options do not align with this fundamental concept of quantum mechanics.