Multiple Choice
How many electrons can the first energy level (closest to the nucleus) hold before it is full?
10. Periodic Properties of the Elements
The Electron Configuration
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Which three principles are used to determine the electron configuration of an atom?
A
Bohr model, Law of Multiple Proportions, Le Chatelier's principle
B
Heisenberg uncertainty principle, Law of Conservation of Mass, Avogadro's law
C
Octet rule, Law of Definite Proportions, Dalton's atomic theory
D
Aufbau principle, Pauli exclusion principle, Hund's rule
Verified step by step guidance1
Understand that electron configuration describes the arrangement of electrons in an atom's orbitals.
Identify the three key principles that govern how electrons fill atomic orbitals: the Aufbau principle, the Pauli exclusion principle, and Hund's rule.
The Aufbau principle states that electrons occupy the lowest energy orbitals available before filling higher energy orbitals.
The Pauli exclusion principle 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.
Hund's rule states that electrons will fill degenerate orbitals (orbitals of the same energy) singly and with parallel spins before pairing up.
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The Electron Configuration practice set
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