| ⇦ | 
| ⇨ |
Aufbau principle does not give the correct arrangement of filling up of atomic orbitals in
Options
(a) Cu and Zn
(b) Co and Zn
(c) Mn and Cr
(d) Cu and Cr
Correct Answer:
Cu and Cr
Explanation:
The electronic configuration of chromimum and copper are different than that we expected. According to Aufbau’s principle the electronic configurations of copper and chromium are : Cr = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁴. Cu = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁹. However, the actual configurations are, Cr = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d⁵. Cu = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d¹⁰. this is due to the fact that half filled and completely filled electronic configurations have lower energy. Thus to become more stable one of the 4s electrons goes into the nearby 3d-orbitals so that 3d-orbitals get half-filled in Cr and completely filled in Cu.
Related Questions: - Which of the following is a pair of isoelectronic species?
- The limiting radius ratio for tetrahedral shape is
- If the melting point of ice is 0⁰C and latent heat of fusion is 5.46 kJ mol⁻¹,
- The catalyst SnCl₂ / HCl is used in
- Excess nitrate in drinking water can cause
Topics: D and F Block Elements
(91)
Subject: Chemistry
(2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Which of the following is a pair of isoelectronic species?
- The limiting radius ratio for tetrahedral shape is
- If the melting point of ice is 0⁰C and latent heat of fusion is 5.46 kJ mol⁻¹,
- The catalyst SnCl₂ / HCl is used in
- Excess nitrate in drinking water can cause
Topics: D and F Block Elements (91)
Subject: Chemistry (2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply