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AP Chemistry
1.6 Photoelectron Spectroscopy
1.5 Atomic Structure and Electron Configuration
IntermediateMCQDrawing RepresentationsGraphicalConceptual22.3k
A grayscale photoelectron spectrum graph with a horizontal axis labeled Binding Energy (\(\text{MJ/mol}\)) and a vertical axis labeled Relative Number of Electrons. The horizontal axis is ordered from high binding energy on the left to low on the right, with logarithmic scale markers at \(1000\), \(100\), \(10\), \(1\), and \(0.1\). The vertical axis has uniform tick marks from \(0\) to \(8\) without gridlines. Exactly five solid black vertical peaks appear: peak 1 at \(208\text{ MJ/mol}\) with a height of \(2\) units; peak 2 at \(18.7\text{ MJ/mol}\) with a height of \(2\) units; peak 3 at \(13.5\text{ MJ/mol}\) with a height of \(6\) units; peak 4 at \(1.95\text{ MJ/mol}\) with a height of \(2\) units; and peak 5 at \(1.01\text{ MJ/mol}\) with a height of \(3\) units. No other peaks, labels, gridlines, or annotations appear.
Complete photoelectron spectrum of an unknown neutral element.
A complete photoelectron spectrum of a neutral unknown element is shown below.

Based on the spectrum, which of the following correctly identifies the element and the total number of valence electrons in an atom of the element?

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