![](/assets/images/picto-drapeau-france-3a76576a5d60a512053b4612ab58dae5.png)
3. Acidity of the hydrogen atom bonded to a metal atom
The first known metal-hydrogen bonded compounds are [HCo(CO)
4
] and [H
2
Fe(CO)
4
]. These hydride ligands correspond, most of the time, to a bond polarity
, rarely to
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Acidity of the hydrogen atom bonded to a metal atom