|Class 12 Chemistry D and F Block Elements||Magnetic Properties|
Substances, depending on their behaviour in an external magnetic field, are classified into 2 types:
Fig. A trickle of liquid oxygen is deflected by a magnetic field, illustrating its paramagnetism.
In 3d series the orbital angular momentum of the electrons of the elements is less due to which they exhibit less contribution.
The magnetic moment for these elements is calculated using the spin only formula
μ = √(n(n+2))
Where n = number of unpaired electrons
μ = magnetic moment in units of Bohr Magneton (BM).
PROBLEM: Calculate the 'spin only' magnetic moment of M2+(aq) ion (Z = 27).
SOLUTION: Z = 27 = [Ar] 3d7 4s2
M2+ = [Ar] 3d7
This means that it has 3 unpaired electrons.
n = 3