Multiple Choice
How many electrons can the third energy level (n = 3) hold in an atom?
1
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10. Periodic Properties of the Elements
The Electron Configuration
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
In an orbital diagram, which rule states that electrons must occupy orbitals singly before pairing up within a subshell?
A
Hund's rule
B
Heisenberg uncertainty principle
C
Aufbau principle
D
Pauli exclusion principle
Verified step by step guidance1
Understand that an orbital diagram visually represents the arrangement of electrons in atomic orbitals within a subshell.
Recall that the question asks which rule requires electrons to occupy orbitals singly before pairing up in the same subshell.
Review the four options: Hund's rule, Heisenberg uncertainty principle, Aufbau principle, and Pauli exclusion principle.
Recognize that Hund's rule specifically states that electrons fill degenerate orbitals (orbitals of the same energy) singly and with parallel spins before any pairing occurs.
Conclude that Hund's rule explains the observed electron arrangement in orbital diagrams where electrons occupy orbitals singly first.
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