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AP Chemistry
1.7 Periodic Trends
1.6 Photoelectron Spectroscopy
1.5 Atomic Structure and Electron Configuration
IntermediateMCQMathematicalConceptual17.1k
The photoelectron spectroscopy (PES) data for nitrogen (\(\text{N}\)) and an unknown neutral Period \(2\) element, \(\text{X}\), are shown in the table below.

PeakElement \(\text{N}\) Binding Energy (\(\text{MJ/mol}\))Element \(\text{X}\) Binding Energy (\(\text{MJ/mol}\))Relative Peak Area for Element \(\text{X}\)
1\(39.6\)\(52.6\)\(2\)
2\(2.45\)\(3.04\)\(2\)
3\(1.40\)\(1.31\)\(4\)

Based on the data, which of the following identifies element \(\text{X}\) and provides the correct explanation for why the binding energy of Peak 3 is lower for element \(\text{X}\) than for element \(\text{N}\)?

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