What conclusion can be drawn about an unknown element whose photoelectron spectroscopy reveals four peaks with decreasing ionization energies as more electrons are removed?
A.
The element exhibits strong magnetic properties due to unpaired d electrons.
B.
The element's valence shell contains only p-orbital electrons without any s-orbital contribution.
C.
The element likely possesses two electrons in an s orbital before moving onto p orbitals.
D.
The element has fully occupied d orbitals that shield outer electrons.
Exam No：AP Chemistry Practice Test Year：2024 Question No：APChemistry2024AP0369
Answer:
C
Knowledge points:
1.6 Photoelectron Spectroscopy
Solution:
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