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State the aufbau principle. Choose one:

(A) No two electrons in an atom can have the same set of four quantum numbers.
(B) The lowest-energy electron configuration of an atom has the maximum number of unpaired electrons, all of which have the same spin, in degenerate orbitals.
(C) Electrons orbiting and protons within the nucleus of the atom have a balanced charge, excluding attraction to charged species.
(D) We cannot determine both the position and the momentum of an electron in an atom at the same time.
(E) Each electron goes into the lowest energy orbita

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Answer:

The right answerb is E, according to the aufbau principle.

Explanation:

The Aufbau principle states that:

Any electron will occupy the lowest available energy level. For instance, let's  work on the electronic configuration of Sodium atom Na. It has 11 electrons and they are all filled into the orbitals according to their energies and starting from the lowest as shown here.

1s² 2sb² 2p⁶ 3s¹  It means that the 1s orbital is filled before the 2s is occupied.b

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