Multiple Choice
Which of the following represents the correct electron configuration for a neutral atom of vanadium (atomic number 23)?
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10. Periodic Properties of the Elements
The Electron Configuration
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Which of the following is the correct electron configuration for the As^{3-} ion?
A
1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^6
B
1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^4
C
1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^5
D
1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^3
Verified step by step guidance1
Identify the atomic number of arsenic (As), which is 33. This means a neutral arsenic atom has 33 electrons.
Determine the number of electrons in the As^{3-} ion by adding 3 extra electrons to the neutral atom's 33 electrons, resulting in 36 electrons.
Write the electron configuration for 36 electrons by filling orbitals in order of increasing energy: 1s, 2s, 2p, 3s, 3p, 4s, 3d, and 4p.
Recall the order of filling orbitals: 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 4s^2, 3d^{10}, and then 4p orbitals. Since there are 36 electrons, the 4p orbitals will be fully filled with 6 electrons.
Combine all the filled orbitals to write the full electron configuration for As^{3-} as: $1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^6$.
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