Early atomic models assumed that subshell energy increased strictly with the…
CHEMISTRY · Subjective · AP · Chemistry · Atomic Structure and Properties · Atomic Structure and Properties
Problem
Early atomic models assumed that subshell energy increased strictly with the principal quantum number n. Cite one piece of evidence from modern PES spectra that contradicts this assumption, and explain—in two to three sentences—how the evidence supports the contemporary shell model that includes penetration and shielding effects.