Easy 10 points. Tried everything but can’t figure this out! I tried [Ar] 4s2 3d2 but it’s saying wrong answer.
The electronic configuration of Mn is: [Ar] 4s2 3d5
When the Mn atom loses electrons to form an ion, the 4s2 electrons go first, so:
Mn2+ would have a configuration of [Ar] 3d5.
The 3d electrons go next, so Mn3+ would have a configuration of [Ar] 3d4.
For Mn it is [Ar] 4s2 3d5
For Mn 3+ ion, it could be [Ar] 3d4 , because it has 3 electrons less.
for mastering chemistry
this is the long hand configuration –