Question:
Which transition series includes elements Co and Mo respectively?
Which transition series includes elements Co and Mo respectively?
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Find the atomic numbers of Co and Mo and see which d subshell is being filled.
Updated On: Nov 13, 2026
- 4d and 5d
- 5d and 6d
- 3d and 4d
- 3d and 6d
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Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept
Transition series are named after the d subshell being filled: 3d (Sc to Zn), 4d (Y to Cd) and 5d (La, Hf to Hg).
Step 2: Locate Co
Cobalt has \(Z=27\) and configuration \([\text{Ar}]3d^{7}4s^{2}\), so it is in the 3d series.
Step 3: Locate Mo
Molybdenum has \(Z=42\) and configuration \([\text{Kr}]4d^{5}5s^{1}\), so it is in the 4d series.
Final Answer:
Co belongs to the 3d series and Mo to the 4d series. \[ \boxed{\text{(C) }\text{3d and 4d}} \]
Transition series are named after the d subshell being filled: 3d (Sc to Zn), 4d (Y to Cd) and 5d (La, Hf to Hg).
Step 2: Locate Co
Cobalt has \(Z=27\) and configuration \([\text{Ar}]3d^{7}4s^{2}\), so it is in the 3d series.
Step 3: Locate Mo
Molybdenum has \(Z=42\) and configuration \([\text{Kr}]4d^{5}5s^{1}\), so it is in the 4d series.
Final Answer:
Co belongs to the 3d series and Mo to the 4d series. \[ \boxed{\text{(C) }\text{3d and 4d}} \]
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