Multiple Choice
How many electrons can be accommodated in the third energy level (n = 3) of an atom?
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10. Periodic Properties of the Elements
The Electron Configuration
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Which of the following statements is NOT true about electron configurations?
A
Hund's rule states that electrons occupy degenerate orbitals singly before pairing.
B
Electrons fill orbitals in order of increasing energy, following the Aufbau principle.
C
All elements have the same electron configuration.
D
The 3d subshell is filled after the 4s subshell in neutral atoms.
Verified step by step guidance1
Step 1: Understand the concept of electron configuration, which describes the arrangement of electrons in an atom's orbitals according to specific rules.
Step 2: Review Hund's rule, which states that electrons occupy degenerate orbitals (orbitals of the same energy) singly and with parallel spins before pairing up.
Step 3: Recall the Aufbau principle, which says electrons fill orbitals starting from the lowest energy level to higher energy levels in a specific order.
Step 4: Recognize that the 4s subshell is filled before the 3d subshell in neutral atoms, meaning 4s electrons are added prior to 3d electrons.
Step 5: Identify that the statement 'All elements have the same electron configuration' is incorrect because each element has a unique electron configuration based on its atomic number.
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