s orbital → can hold a maximum of 2 electrons
p orbitals → can hold a maximum of 6 electrons
d orbitals → can hold a maximum of 10 electrons
f orbitals → can hold a maximum of 14 electrons
Mn2+ ion is 1s22s22p63s23p63d5
To find the number of unpaired electrons, fill up the 3d subshell. All of the electrons in lower energy orbitals are already paired.
3d subshell → 5 electrons
d → 5 orbitals
When filling up the orbitals, keep in mind:
The ground-state electron configuration of a Mn2+ ion is 1s22s22p63s23p63d5. Therefore, Mn2+ is
a. paramagnetic with two unpaired electrons.
b. paramagnetic with one unpaired electron.
c. paramagnetic with five unpaired electrons.
e. paramagnetic with three unpaired electrons.
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