Which of the following provides the best evidence for the presence of the electron shell structure of atoms?
A) The decrease in ionization energy going down a group.
B) The increase in ionization energy across a period.
C) That the value of ms can be +1/2 or -1/2
D) That the ionization energy of O is less than the ionization energy of N.
E) All of the above provide evidence for the shell structure of atoms.
Correct Answer:
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