Explanation of Magnetic Moment in [Mn(NH3)6]Br2

Introduction:
The magnetic moment of a coordination complex is a measure of its magnetic properties. It arises from the presence of unpaired electrons in the d-orbitals of the central metal ion.

Magnetic Moment Calculation:
The magnetic moment of a coordination complex can be calculated using the following formula:
μ = √(n(n+2))
Where:
μ = magnetic moment
n = number of unpaired electrons

[Mn(NH3)6]Br2:
In the complex [Mn(NH3)6]Br2, the central metal ion is manganese (Mn) with a total of 5 unpaired electrons in its d-orbitals.

Calculation:
n = 5 unpaired electrons
μ = √(5(5+2))
= √35
≈ 5.92 BM (Bohr magneton)

Conclusion:
The magnetic moment of [Mn(NH3)6]Br2 is approximately 5.92 BM, indicating the presence of 5 unpaired electrons in the d-orbitals of the manganese ion, leading to its magnetic properties.