Multiple Choice
Which of the following is the correct ground-state electron configuration for the Cd^{2+} ion?
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10. Periodic Properties of the Elements
The Electron Configuration: Ions
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Which of the following is the correct electron configuration for the fluoride ion (F⁻)?
A
1s^2 2s^2 2p^4
B
1s^2 2s^2 2p^5
C
1s^2 2s^2 2p^3
D
1s^2 2s^2 2p^6
Verified step by step guidance1
Step 1: Identify the atomic number of fluorine (F). Fluorine has an atomic number of 9, which means a neutral fluorine atom has 9 electrons.
Step 2: Understand that the fluoride ion (F⁻) has gained one extra electron compared to the neutral atom, so it has 10 electrons in total.
Step 3: Write the electron configuration for 10 electrons by filling the orbitals in order of increasing energy: 1s, 2s, then 2p.
Step 4: Recall the maximum number of electrons each subshell can hold: 1s can hold 2, 2s can hold 2, and 2p can hold 6 electrons.
Step 5: Combine these to write the full electron configuration for F⁻ as \$1s^{2} 2s^{2} 2p^{6}$, indicating a filled 2p subshell.
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