IUPAC Name of Ni(CO)4
Ni(CO)4 is a chemical compound composed of a nickel atom coordinated with four carbon monoxide molecules. The IUPAC name for Ni(CO)4 is tetracarbonylnickel(0). Let's break down the name and understand it in detail.

Tetracarbonylnickel(0)
- Tetracarbonyl: The prefix "tetra-" indicates that there are four carbon monoxide ligands bound to the nickel atom in the compound.
- Nickel: Refers to the central metal atom in the complex.
- (0): The Roman numeral in parentheses indicates the oxidation state of the central metal atom, which is zero in this case. This is because each carbon monoxide ligand donates a lone pair of electrons to the nickel atom, resulting in a neutral complex.

Overall Structure
- In the Ni(CO)4 molecule, the nickel atom is in the center and is surrounded by four carbon monoxide ligands.
- Each carbon monoxide ligand forms a coordinate covalent bond with the nickel atom, where the lone pair of electrons on the oxygen atom of CO is donated to the nickel atom.

Chemical Properties
- Ni(CO)4 is a colorless volatile liquid at room temperature.
- It is used as a precursor for the synthesis of other nickel carbonyl compounds.
In conclusion, the IUPAC name tetracarbonylnickel(0) accurately describes the composition and structure of the Ni(CO)4 molecule, highlighting the presence of four carbon monoxide ligands coordinated to a zero-valent nickel atom.