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AP Chemistry
1.7 Periodic Trends
1.5 Atomic Structure and Electron Configuration
IntermediateMCQConceptual18k
The table below provides the atomic numbers and valence electron configurations for four elements in Period 3 of the periodic table.

ElementAtomic numberValence 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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