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What is the electron configuration of Chromium (Cr)?
What is the electron configuration of Chromium (Cr)?
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Practice Questions
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Q1
What is the electron configuration of Chromium (Cr)?
[Ar] 4s2 3d4
[Ar] 4s1 3d5
[Ar] 4s2 3d5
[Ar] 4s2 3d3
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Chromium has an electron configuration of [Ar] 4s1 3d5 due to stability from half-filled d-orbitals.
Questions & Step-by-step Solutions
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Q
Q: What is the electron configuration of Chromium (Cr)?
Solution:
Chromium has an electron configuration of [Ar] 4s1 3d5 due to stability from half-filled d-orbitals.
Steps: 11
Show Steps
Step 1: Identify the atomic number of Chromium (Cr), which is 24.
Step 2: Write the electron configuration in order of increasing energy levels: 1s, 2s, 2p, 3s, 3p, 4s, 3d.
Step 3: Fill the orbitals with electrons according to the Aufbau principle, Hund's rule, and the Pauli exclusion principle.
Step 4: Fill the 1s orbital with 2 electrons: 1s2.
Step 5: Fill the 2s orbital with 2 electrons: 2s2.
Step 6: Fill the 2p orbital with 6 electrons: 2p6.
Step 7: Fill the 3s orbital with 2 electrons: 3s2.
Step 8: Fill the 3p orbital with 6 electrons: 3p6.
Step 9: Fill the 4s orbital with 2 electrons: 4s2.
Step 10: Now, fill the 3d orbital. Instead of filling it with 4 electrons first, we fill it with 5 electrons to achieve stability: 3d5.
Step 11: Combine the filled orbitals to write the final electron configuration: [Ar] 4s1 3d5.
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