Mn is configured: [Ar] 4s2 3d5 , so
Mn2+ has an electron configuration of: [Ar] 4s0 3d5
It looks like that 5 or 3 or (at least) 1 (one) electrons are to be unpaired.
three unpaired electrons
Germanium has 4 unpaired electrons.
There are three unpaired electrons in an arsenic atom. Arsenic has five valence electrons, with two paired and three unpaired electrons.
6 unpaired electrons
Xenon has eight unpaired electrons.
In potassium permanganate (KMnO4), the manganese (Mn) atom is in the +7 oxidation state, leading to its electron configuration of [Ar] 3d^0 4s^0. Since there are no electrons in the 3d or 4s orbitals, there are no unpaired electrons in KMnO4. Therefore, KMnO4 has zero unpaired electrons.
There are no unpaired electrons in strontium.
three unpaired electrons
Germanium has 4 unpaired electrons.
Aluminum has three unpaired electrons.
There are three unpaired electrons in an arsenic atom. Arsenic has five valence electrons, with two paired and three unpaired electrons.
6 unpaired electrons
Phosphorus has three unpaired electrons in its ground state.
Nickel has two unpaired electrons.
Xenon has eight unpaired electrons.
Titanium (Ti) has four unpaired electrons.
Neodymium (Nd) has 3 unpaired electrons.