Effective Atomic Number
The effective atomic number (EAN) of Ni in [Ni(CO)4] is:
Select the correct option:
Solution
36
Nickel has atomic number 28 and oxidation state 0 in [Ni(CO)4]. Each CO donates 2 electrons, so four CO ligands donate 8 electrons. EAN = 28 + 8 = 36, which matches the noble gas krypton.
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About This Question
- Subject
- chemistry
- Chapter
- coordination compounds
- Topic
- effective atomic number
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
36
Nickel has atomic number 28 and oxidation state 0 in [Ni(CO)4]. Each CO donates 2 electrons, so four CO ligands donate 8 electrons. EAN = 28 + 8 = 36, which matches the noble gas krypton.
This medium difficulty chemistry question is from the chapter coordination compounds, covering the topic of effective atomic number. It appeared in the 2025 exam.
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