Metal oxides are chemical compounds containing a metal and oxygen; the are generally solids.
They are formed by reaction with oxygen from the air.
Oxides of more electropositive elements tend to be basic. They are called basic anhydrides; adding water, they may form basic hydroxides. For example, sodium oxide is basic; when hydrated, it forms sodium hydroxide.
Oxides of more electronegative elements tend to be acidic. They are called acid anhydrides; adding water, they form oxoacids. For example, dichlorine heptoxide is acid; perchloric acid is a more hydrated form.
Some oxides can act as both acid and base at different times. They are amphoteric. An example is aluminium oxide. Some oxides do not show behavior as either acid or base.
The oxides of the chemical elements in their highest oxidation state are predictable and the chemical formula can be derived from the number of valence electrons for that element. Even the chemical formula of O4, tetraoxygen, is predictable as a group 16 element. One exception is copper for which the highest oxidation state oxide is copper(II) oxide and not copper(I) oxide. Another exception is fluorine that does not exist as expected as F2O7 but as OF2.[1] Since F is more electronegative than O, OF2 does not represent an oxide of fluorine, but instead represents a fluoride of oxygen. Phosphorus pentoxide, the third exception is not properly represented by the chemical formula P2O5 but by P4O10.
Some examples: TiO2, ZnO, U3O8, ThO2, PuO2, CdO, PbO2, Fe2O3, etc.
Examples: uranium oxides, sodium oxides, lead oxides, aluminium oxide, plutonium oxides etc.
Examples: P2O5, As2O3, H2O, NO2, SO2, ClO3, Cl2O, I2O5, etc.
Examples: uranium dioxide (UO2), calcium oxide (CaO).
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Metal oxides form alkalis when they dissolve in water. Non-metal oxides for acids. For example: carbon dioxide + water --> carbonic acid magnesium oxide + water --> magnesium hydroxide
Hydrogen react with metals and hydrides are formed.
oxides are formed when a element reacts with Oxygen
Metallic oxides
Metals which are above Carbon in the reactivity series, eg. Magnesium. These metals need to be extracted by electrolysis.
Alkali earth metals react with oxygen to form basic oxides.
Basic oxides
group one and two metals react with oxygen in the air as well as moisture to from metal oxides
Oxides of protactinium are formed: PaO, PaO2, Pa2O5.
metal oxide
alkaline earth metals
When metals react with oxygen they produce metal oxides. A common example would be that of Iron which in the presence of oxygen and water form rust (a mixture of metal oxides and metal hydroxides)
Metals usually have a characteristic lustre, so you can often tell just by looking. The metals conduct electricity when solid, and non-metals, with the exception of graphite, do not. Metals react with oxygen to give basic oxides, whereas non-metals give acidic oxides.
Metal oxides form alkalis when they dissolve in water. Non-metal oxides for acids. For example: carbon dioxide + water --> carbonic acid magnesium oxide + water --> magnesium hydroxide
how do metals react with oxygen
Hydrogen react with metals and hydrides are formed.
Plutonium react easily with water: oxides and hydrides are formed.