NICKEL(II) OXIDE

Nickel(II) oxide
General
Other names	nickelous oxide nickel monoxide
Molecular formula	NiO
Molar mass	74.69 g/mol
Appearance	green crystalline solid
CAS number	[1313-99-1]
Properties
Density and phase	6.67 g/cm3, solid
Solubility in water	negligible
Melting point	1984°C
Boiling point	?
'Hazards'
MSDS	ScienceLab.com
EU classification	not listed
NFPA 704	nfpa_h1.png nfpa_f0.png nfpa_r0.png
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)

'Nickel(II) oxide' is the chemical compound with the formula NiO. This species adopts the NaCl structure, with octahedral Ni(II) and O^2- sites. It is formed by the pyrolysis of a variety of nickel(II) compounds such as Ni(OH)₂, Ni(NO₃)₂, and NiCO₃. Like many other binary metal oxides, NiO is often nonstoichiometric, meaning that the Ni:O ratio deviates from 1:1.
Other nickel oxides are Ni₂O₃ and NiCO₂.

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