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Magnetic moment 2.84BM is given by:
(Atomic numbers: Ni=28,Ti=22,Cr=24,Co=27 )
A. Cr2+B. Co2+C. Ni2+D. Ti3+

Answer
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Hint: In order to solve the given problem first we will see the relation between the magnetic moment of the atom and the number of unpaired electrons in the configuration of that element. Further on the basis of this relation we will find the number of unpaired electrons present for the given element with the required magnetic moment further we will find the element with the same number of unpaired electrons amongst the given option.


Complete step by step answer:
Given that the element has 2.84BM magnetic moment.
As we know the relation between the spin only magnetic moment of an element and the number of unpaired electrons in the ion is given as:
μeff=n(n+2)
In the above relation μeff represents the effective spin only magnetic moment of the atom.
And in the above relation “n” represents the number of unpaired electrons.
As we know that μeff=2.84BM .so let us find the value of “n” or number of unpaired electrons.
μeff=2.84BMn(n+2)=2.84n(n+2)=(2.84)2=8.06568n(n+2)=2×4n=2

So, the number of unpaired electrons must be 2 for having required magnetic moment.
As we know that Ni2+ has atomic number 28.
So it will have 3d8 electronic configuration.
This electronic configuration can also be written in the following manner.
t2g6eg2

From the above configuration we can see that nickel ions have 2 unpaired electrons which is the requirement to have required magnetic moment.
Hence, magnetic moment 2.84BM is given by Ni2+ ion.
So, the correct answer is “Option C”.

Note: In order to solve such types of students must know the general meaning of magnetic moment. The magnetic moment is the magnetic power and orientation of a magnet or other magnetic field generating entity. An object's magnetic dipole moment is conveniently defined in terms of the torque encountered by the object in a given magnetic field. Also students must remember the formula for the magnetic moment of the ion. And also should know the method to find the unpaired electron in the ion.
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