Atomic Structure Question 473

Question: Magnetic moments of Cr(Z=24),,Mn(Z=25) and Fe(Z=26) are x,,y and z respectively.

Hence,

Options:

A) x=y=z

B) x=y<z

C) x<y<z

D) x>y>z

Show Answer

Answer:

Correct Answer: D

Solution:

  • Cr(24)=1s2,,2s2,,2p6,,3s2,,3p6,,4s1,,3d5 Mn,(25)=1s2,,2s2,,2p6,,3p6,,4s2,,3d5 Fe(26)=1s2,,2s2,,2p6,,3s2,,3p6,,4s2,,3d6 Magnetic moment (μ)=n(n+2) where, n= number of unpaired electrons. Greater the number of unpaired electrons, greater will be the magnetic moment.


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