Question

The correct ground state electronic configuration of chromium atom is : (a) [Ar] 3d⁵ 4s¹ (b) [Ar] 3d⁴ 4s²(c) [Ar] 3d⁶ 4s⁰ (d) [Ar] 4d⁵ 4s¹

Answer 1

option 'a' is the correct answer

Answer 2

The correct ground state electronic configuration of chromium atom is [Ar] 3d⁵ 4s¹.

• Chromium has the symbol Cr.
• It is 3d block metal. It has an atomic number of 24.
• Thus its electronic configuration is as follows-
• ${1s}^{2} {2s}^{2} {2p}^{6} {3s}^{2} {3p}^{6} {4s}^{1} {3d}^{5}$
• Argon has the symbol Ar and has an atomic number of 18.
• Thus the electronic configuration of Ar is as follows-
• ${1s}^{2} {2s}^{2} {2p}^{6} {3s}^{2} {3p}^{6}$
• Thus the electronic configuration of Cr is can be given as [Ar] 3d⁵ 4s¹
• Hence the correct option is b.