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1. Mononuclear carbonyl metals
1.1 Metals with even atomic numbers
The action of carbon monoxide on nickel metal leads to nickel carbonyl :
This compound is a volatile, colorless, highly toxic liquid with a boiling point of 34°C. These characteristics were very surprising at the time of its discovery, a time when the idea of covalent bonding as defined by Lewis was not yet advanced. It was soon discovered that this compound is sensitive to heat, and a higher temperature will decompose it:
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Mononuclear carbonyl metals