Question

How does the magnetic behaviour of 3rd row transition elements differ from the elements of first and second row transition series? Explain with suitable example.

Answer 1

Third row of transition elements has more magnitude of the magnetic moment due to unpaired electrons.

Explanation:

• The magnetic behavior of the electron is generated due to orbital and spin motion of electron about its own axis.
• Electron is a charged particle and it's spinning produces the magnetic field.
• An unpaired electron is more vulnerable to interact with the applied magnetic field.
• Therefore the third row of transition elements has more unpaired electrons as compared to the first and second row.
• Therefore third row of transition elements has more magnitude of the magnetic moment.  
• Nb and Tc both have a half-filled 5 s sub shell.