Question

What is EAN of Co in \([\text{Co}(\text{NH}_3)_6]^{3+}\)?

• A. \(24\)
• B. \(27\)
• C. \(36\)
• D. \(30\)

Hint:

EAN = atomic number - oxidation state + 2 x coordination number.

Answer 1

The Correct Option is C

Step 1: Count electrons
Co$^{3+}$ has $27-3=24$ electrons.

Step 2: Add ligand electrons
Six NH$_3$ ligands give $6\times2 = 12$ electrons. Total $=24+12=36$, option (C).

Final Answer:
The EAN is 36, option (C). \[ \boxed{36} \]