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AP Chemistry
1.6 Photoelectron Spectroscopy
IntermediateMCQGraphicalConceptual22.2k
A photoelectron spectrum shown on bare axes without gridlines. The horizontal x-axis is labeled Binding Energy (MJ/mol) with values decreasing from left to right, marked with tick marks at 200, 100, 10, 1, and 0.1. The vertical y-axis is labeled Relative Number of Electrons with tick marks from 0 to 6 at integer intervals. Five solid vertical lines representing peaks appear from left to right: the first peak is located at 193 MJ/mol with a height of 2 units; the second peak is located at 18.7 MJ/mol with a height of 2 units; the third peak is located at 13.5 MJ/mol with a height of 6 units; the fourth peak is located at 1.06 MJ/mol with a height of 2 units; the fifth peak is located at 0.75 MJ/mol with a height of 3 units. No other peaks, labels, text, or annotations appear.
Complete photoelectron spectrum of an unknown element.
The complete photoelectron spectrum of a neutral atom of an unknown element is shown above. Which of the following correctly identifies the element and provides a valid justification based on the spectrum?

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