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Which of the following is the correct electron configuration for calcium (atomic number 20)?
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10. Periodic Properties of the Elements
The Electron Configuration
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How many electrons can the first electron shell (n = 1) hold?
A
6
B
2
C
4
D
8
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Recall that the maximum number of electrons in any electron shell is given by the formula \$2n^2$, where $n$ is the principal quantum number (shell number).
Identify the principal quantum number for the first electron shell, which is \(n = 1\).
Substitute \(n = 1\) into the formula: \(2 \times (1)^2\).
Calculate the value inside the parentheses first: \((1)^2 = 1\).
Multiply by 2 to find the maximum number of electrons: \(2 \times 1 = 2\) electrons.
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