Question

Which of the following statements are correct?

1. The electronic configuration of Cr is [Ar] 3 d 54 s 1.
2. The magnetic quantum number may have a negative value.
3. In the ground state of an atom, the orbitals are filled in order of their increasing energies.
4. The total number of nodes are given by n – 2.

Choose the most appropriate answer from the options given below :

• A. (A), (C) and (D) only
• B. (A) and (B) only
• C. (A) and (C) only
• D. (A), (B) and (C) only

Answer 1

Answer: (D)

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

Answer 2

Cr = (Ar)3 d 54 s 1
M = +l to –l
As per Aufbau principle, orbitals are filled in increasing order of energy.
Total number of nodes = (n – 1)

So, the correct option is (D): (A), (B) and (C) only.