Multiple Choice
How many d orbitals are present when the principal quantum number n = 4?
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10. Periodic Properties of the Elements
The Electron Configuration
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Which of the following lists the three fundamental rules that govern the filling of atomic orbitals by electrons?
A
Octet rule, Pauli exclusion principle, Hund's rule
B
Aufbau principle, Pauli exclusion principle, Hund's rule
C
Aufbau principle, Lewis rule, Hund's rule
D
Aufbau principle, Octet rule, Lewis rule
Verified step by step guidance1
Understand that the question asks for the three fundamental rules that govern how electrons fill atomic orbitals.
Recall the Aufbau principle, which states that electrons fill orbitals starting from the lowest energy level to higher energy levels.
Recall the Pauli exclusion principle, which states that no two electrons in an atom can have the same set of four quantum numbers, meaning each orbital can hold a maximum of two electrons with opposite spins.
Recall Hund's rule, which states that electrons will fill degenerate orbitals (orbitals of the same energy) singly first, with parallel spins, before pairing up.
Identify that the correct set of rules is Aufbau principle, Pauli exclusion principle, and Hund's rule, as these three together describe the electron filling order and arrangement in orbitals.
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