Magnetism in coordination compounds is influenced by the presence of unpaired electrons in the metal ion. In the case of [Mn(NH3)6]Br2, manganese (Mn) is the central metal ion.

- Manganese in its +2 oxidation state has 5 unpaired electrons in its d orbitals.
- These unpaired electrons contribute to the magnetic properties of the compound.

- Due to the presence of unpaired electrons, [Mn(NH3)6]Br2 exhibits paramagnetic behavior.
- Paramagnetic substances are weakly attracted to a magnetic field due to the alignment of their magnetic dipoles.

- In [Mn(NH3)6]Br2, the magnetic moments of individual manganese ions align in the presence of an external magnetic field.
- This alignment results in a net magnetic moment, leading to the paramagnetic behavior observed in the compound.

- The presence of unpaired electrons in the manganese ion of [Mn(NH3)6]Br2 contributes to its paramagnetic nature.