The Effective Atomic Number (EAN) of nickel in Ni $(C O_{4})$ is:

36

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38

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28

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54

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Solution

Effective atomic number (EAN) is defined as the total number of electrons present around the central metal ion.
Effective atomic number (EAN)
= Atomic no. of central atom - oxidation state + 2 $\times$ no. of ligands
Here, atomic number of Nickel is 28.
$∴$ EAN $= 28 - 0 + 2 \times 4 = 36$

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