Neutral Cr: (transition metal)
Atomic number → 24 → 24 e-
s _ 1 orbital → max of 2 electrons
p _ _ _ 3 orbitals → max of 6 electrons
d _ _ _ _ _ 5 orbitals → max of 10 electrons
Fill up the orbitals with electrons:
Aufbau Principle → totally fill in the lowest energy orbital first
Hund’s Rule → electron orbitals that are degenerate (same energy) are first half-filled before they are totally filled
Electron configuration (lowest energy level to the highest energy level: s < p < d < f):
The total number of electrons in the 3d orbitals of Cr3+ is
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