Question

Which of the following has maximum magnetic moment ?
(a) V3+
(b) Cr3+
(c) Fe3+
(d) C3+

Answer 1

The element that has maximum magnetic moment is (c) Fe3+.

• The magnetic moment of an element is maximum when an unpaired electron is maximum.
• The unit of magnetic moment is the Bohr magneton.
• Diamagnetic substances have zero unpaired electrons. hence, they have zero magnetic moments.
• $magnetic \: momet \: = \sqrt{n(n + 2)} \\ n \: is \: number \: of \: unpaired \: \: electron$
• V3+ has 2 unpaired electrons, Cr3+ has 3 unpaired electrons and Fe3+ has 5 unpaired electrons.
• So, the magnetic moment is the maximum for the Fe3+ ion.