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Question:

How many electrons in an atom may have the following quantum numbers?

Solution:

(a) The fourth energy level contains 2n² = 2 × 4² = 32 electrons. Out of these, one half or 16 electrons have ms = +1/2. The remaining half, i.e, 16 electrons have ms = -1/2 (b) 2 electrons are present in 3s orbital.