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According to the Aufbau principle,
a. electrons enter orbitals of lowest energy first.
b. electrons enter orbitals of highest energy first.
c. an orbital may be occupied by only two electrons.
d. electrons in the same orbital must have opposite spins.

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The correct answer is A, electrons enter orbitals of lowest energy first.  The Aufbau principle states that electrons  orbiting atoms fill the lowest energy levels available before filling higher levels. Following this, molecules can go into the most stable electron configuration.

Answer: electrons enter orbitals of lowest energy first.

Explanation:

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