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JEE Main · 2022 · 29 Jun 2022 · Shift 1 · Atomic Structure

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Which of the following statements are correct?
(A) The electronic configuration of Cr is .
(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 .

Choose the most appropriate answer from the options given below :
  1. (A)(A), (C) and (D) only
  2. (B)(A) and (B) only
  3. (C)(A) and (C) only
  4. (D)(A), (B) and (C) only✓ Correct

Answer: (D)

Solution

Analyzing each statement:

(A) Chromium (Cr, Z=24) has the electronic configuration due to extra stability of half-filled d-orbitals. Correct.

(B) The magnetic quantum number ranges from to , so it can indeed have negative values. Correct.

(C) According to the Aufbau principle, orbitals are filled in order of increasing energy in the ground state. Correct.

(D) The total number of nodes in an orbital is given by , not . Incorrect.

Therefore, statements (A), (B), and (C) are correct.

Answer: (D)

JEE Main · 2022 · 29 Jun 2022 · Shift 1 · Single correct option

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