Question:
What is the effective atomic number of Cu in \([\text{Cu(NH}_{3})_{4}]^{2+}\)?
What is the effective atomic number of Cu in \([\text{Cu(NH}_{3})_{4}]^{2+}\)?
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EAN equals atomic number minus oxidation state plus twice the coordination number.
Updated On: Nov 12, 2026
- \(18\)
- \(33\)
- \(35\)
- \(36\)
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept
\(\text{EAN}=Z-\text{oxidation state}+2\times\text{coordination number}\).
Step 2: Find the values
Copper has \(Z=29\).
\(\text{NH}_3\) is neutral, so the oxidation state of Cu is \(+2\).
Four ligands give coordination number \(4\).
Step 3: Calculation
\(\text{EAN}=29-2+2\times 4=35\)
Step 4: Compare the options
The value 35 is the third option.
Final Answer:
The effective atomic number of copper is 35. \[ \boxed{\text{(C) }35} \]
\(\text{EAN}=Z-\text{oxidation state}+2\times\text{coordination number}\).
Step 2: Find the values
Copper has \(Z=29\).
\(\text{NH}_3\) is neutral, so the oxidation state of Cu is \(+2\).
Four ligands give coordination number \(4\).
Step 3: Calculation
\(\text{EAN}=29-2+2\times 4=35\)
Step 4: Compare the options
The value 35 is the third option.
Final Answer:
The effective atomic number of copper is 35. \[ \boxed{\text{(C) }35} \]
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