Multiple Choice
Which statement about the electron-cloud model is true?
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10. Periodic Properties of the Elements
The Electron Configuration
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According to the Aufbau principle, what is the maximum number of electrons that can occupy the third energy level (n = 3) of an atom?
A
20
B
8
C
2
D
18
Verified step by step guidance1
Recall that the maximum number of electrons in a given energy level (shell) is determined by the formula $2n^2$, where $n$ is the principal quantum number (energy level).
Identify the principal quantum number for the third energy level: $n = 3$.
Substitute $n = 3$ into the formula to find the maximum number of electrons: $2 \times (3)^2$.
Calculate the value inside the parentheses first: $(3)^2 = 9$.
Multiply by 2 to get the maximum number of electrons in the third energy level: $2 \times 9 = 18$.
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