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  • Which of the following statements are correct ? (A)  The electronic configuration of  <img alt="\mathrm{Cr} \text { is }[\mathrm{Ar}] 3 \mathrm{~d}^{5} 4 \mathr

Which of the following statements are correct ?

(A)  The electronic configuration of  \mathrm{Cr} \text { is }[\mathrm{Ar}] 3 \mathrm{~d}^{5} 4 \mathrm{~s}^{1}

(B)  The magnetic quantum number may have  a negative value.

(C)  In the ground state of an atom, the orbitals are filled in order of their increasing energies.

(D)  The total number of nodes are given by n-2.

Choose the most appropriate answer from the options given below:

Option: 1

(A), (C) and (D) only


Option: 2

(A) and (B) only


Option: 3

(A)  and (C) only


Option: 4

(A), (B) and (C) only


Answers (1)

As we have learnt,

- \mathrm{Cr} has configuration of  \mathrm{[A r] 4 s^{1} 3 d^{5}}

- Magnetic Quantum number can take vaue from \mathrm{(-\ell) \text { to }(+\ell)}

- In ground state, orbital are filled in order of their increasing energies

- Total number of nodes are given by \mathrm{(n-1)}

Thus statements (A) , (B) and (C) are correct

Hence the correct option is 4

Posted by

Sumit Saini

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