The total number of electrons in the 3d orbitals of cr3+ is

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The total number of electrons in the 3d orbitals of
Cr3+ is

a. 1.

b. 2.

c. 3.

d. 4.

e. 5.

Answer

Number of electron in Cr = 24
Electronic configuration is: 1s2 2s2 2p6 3s2 3p6 3d5 4s1
Explanation: Half filled orbital are more stable.
so instead of 4s2 3d4, we go for 4s1 3d5 where both orbitals are
half filled
Since charge on Cr is +3
So, we need to remove 3 electrons
Electrons are always removed from highest number orbital
Removing 1 electron from 4s
Removing 2 electron from 3d
Final electronic configuration is : 1s2 2s2 2p6 3s2 3p6 3d3

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The number of electrons in 3d orbital is 3

Answer: c


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