Early atomic models assumed that all orbitals having the same principal quantum…
CHEMISTRY · Single correct · AP · Chemistry · Atomic Structure and Properties · Atomic Structure and Properties
Problem
Early atomic models assumed that all orbitals having the same principal quantum number n possessed identical energies. Which observation from modern photoelectron spectroscopy most directly contradicts that assumption?
(a) For most elements, the 2p peak is located at a higher binding energy than the 2s peak.
(b) The 2p peak has roughly three times the intensity of the 2s peak in every spectrum examined.
(c) In every element studied, the 2s peak is found at a higher binding energy than the 2p peak.
(d) Binding-energy peaks for successive electron removals increase gradually with no sudden jumps in value.