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Photoelectron Spectroscopy and Ionization Energy

APCHEM-XNFKGG

Which of the following group 1 elements would show a photoelectron spectrum (PES) peak at the LONGEST wavelength for the removal of the HIGHEST energy electron?

A

Lithium ($Li$).

B

Sodium ($Na$).

C

Potassium ($K$).

D

Rubidium ($Rb$).