Question

The effective atomic number (EAN) of central metal atom in ${[Co(NH3)6]Cl_3}$ is (at. no. of Co=27]

• A. 34
• B. 35
• C. 36
• D. 32

Answer 1

Answer: (C)

36

Answer 2

${EAN= Z - (O.N.) + 2 \times (CN.)}$
???????????????????[Z= atomic number,
????????????O.N. = Oxidation number,
????????C.N. = Coordination number]
??= 27 - 3 + 2 $\times$ 6 = 36