AP Chemistry
1.7 Periodic Trends
The valence electron configurations for three consecutive Period 3 elements are provided in the table below.
Which of the following correctly ranks the three elements in order of increasing first ionization energy?
| Element | Atomic number | Valence electron configuration |
|---|---|---|
| \(\text{Mg}\) | 12 | \(3s^2\) |
| \(\text{Al}\) | 13 | \(3s^2 3p^1\) |
| \(\text{Si}\) | 14 | \(3s^2 3p^2\) |
Which of the following correctly ranks the three elements in order of increasing first ionization energy?
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