Aufbau principle fails to explain the configuration of element with atomic number:
18
24
27
21

Question

Aufbau principle fails to explain the configuration of element with atomic number-18242721

Toppr Admin · Accepted Answer

Chromium has atomic number 24-Actual electronic configuration- 1s22s22p63s23p63d54s1-According to Aufbau- 1s22s22p63s23p63d44s2-Discripency is because of extra stability of half filled -d5- orbitals-

Aufbau principle fails to explain the configuration of element with atomic number:18242721

Chromium has atomic number 24.Actual electronic configuration: 1s22s22p63s23p63d54s1.According to Aufbau: 1s22s22p63s23p63d44s2.Discripency is because of extra stability of half filled (d5) orbitals.

Aufbau principle fails to explain the configuration of element with atomic number:
18
24
27
21

Chromium has atomic number 24.
Actual electronic configuration: $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{5} 4 s^{1}$ .
According to Aufbau: $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{4} 4 s^{2}$ .
Discripency is because of extra stability of half filled $(d^{5})$ orbitals.