Identify the element from its photoelectron spectrum

An example figure from the Photoelectron Spectrum generator.

An unnamed element’s photoelectron spectrum with five peaks and blank lines in place of the sublevel labels — The photoelectron spectrum of an unnamed element, for students to identify: five peaks with blank lines where the sublevel labels go, on a numbered electrons axis so each peak’s height can be read. The peaks hold 2, 2, 6, 2 and 5 electrons from left to right, 17 in all, which is chlorine.

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Answer key

Chlorine (Cl): 1s² 2s² 2p⁶ 3s² 3p⁵
Peaks (MJ/mol, left to right): 1s 273, 2s 26.8, 2p 20.2, 3s 2.44, 3p 1.25

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