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Which of the following electron configurations for a neutral carbon atom represents an excited state?
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10. Periodic Properties of the Elements
The Electron Configuration
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Which element has the ground state electron configuration 1s^2 2s^2 2p^6 3s^2 3p^6 4s^1?
A
Sodium (Na)
B
Potassium (K)
C
Magnesium (Mg)
D
Calcium (Ca)
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Identify the electron configuration given: \$1s^2 2s^2 2p^6 3s^2 3p^6 4s^1$.
Count the total number of electrons by adding the superscripts: \(2 + 2 + 6 + 2 + 6 + 1\).
Recall that the number of electrons in a neutral atom equals the atomic number of the element.
Match the total number of electrons to the atomic number of elements in the periodic table to find the element.
Recognize that the configuration ends with \$4s^1$, which corresponds to the first element in the fourth period with one electron in the 4s subshell, identifying the element as Potassium (K).
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