AP Chemistry
1.7 Periodic Trends
1.5 Atomic Structure and Electron Configuration
The table below provides the atomic numbers and valence electron configurations for four elements in Period 3 of the periodic table.
Based on periodic trends and electron configurations, which of the following correctly ranks these elements in order of decreasing first ionization energy?
| Element | Atomic number | Valence electron configuration |
|---|---|---|
| \(\text{Si}\) | \(14\) | \(3s^2\,3p^2\) |
| \(\text{P}\) | \(15\) | \(3s^2\,3p^3\) |
| \(\text{S}\) | \(16\) | \(3s^2\,3p^4\) |
| \(\text{Cl}\) | \(17\) | \(3s^2\,3p^5\) |
Based on periodic trends and electron configurations, which of the following correctly ranks these elements in order of decreasing first ionization energy?
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