If by why, you mean when, than it's formed when metals react with oxygen.
For example... (underscore_ signifies subscript, sorry I don't know how to use it.)
2Na + O_2 -> Na_2O_2
which is a peroxide
K + O_2 -> KO_2
which is a super peroxide
Hope I helped!
Oxides are formed by combining oxygen with metals. Oxides are compounds that contain at least one oxygen atom bound to one or more metal atoms. This process is known as oxidation.
Non-metal oxides are often referred to as acidic oxides because they produce acidic solutions when they are dissolved in water. These oxides are typically formed by non-metal elements combining with oxygen.
Nitrogen oxides are formed during the combustion of petrol due to high temperatures causing nitrogen and oxygen from the air to react. Specifically, nitrogen oxides are formed through the oxidation of nitrogen in the air when fuel is burned in the engine of a vehicle.
There is no single answer to this question as different group one metals form different oxides. We would expect group one elements to form M2O oxides but in fact only lithium does this when burnt. The other elements more easily lose electrons from their second outermost shell so can form peroxides M2O2, superoxides MO2 or even higher oxidation state oxides. For example Caesium can form Cs7O.
Calcium oxide is definitely a base forming oxide, only nonmetals can have acidic oxides, though some other metal (amphoteric) oxides are also (mainly weak) acid forming oxides.
This element is sodium and the oxides are: Na2O, Na2O2, NaO2.
O2- in oxides, O1- in peroxides
Oxidation is one part of a redox reaction, where redox stands for reduction-oxidation. Oxidation is the loss of electrons or an increase in oxidation state by a molecule, atom, or ion. It need not involve any oxygen and the question is too underspecified to have a sensible answer.
All oxides, peroxides, superoxides, ozonides and compounds with oxy-anions have oxygen atoms in them.
All the types of oxides !
Oxides are compounds that contain oxygen and another element, whereas peroxides are a specific type of oxide that contain the O2^2- ion. Peroxides have an extra oxygen atom compared to regular oxides, which gives them distinct chemical properties.
acidic oxides
Metallic oxides are formed by the reaction of a metal with oxygen and tend to be basic in nature, while non-metallic oxides are formed by the reaction of a non-metal with oxygen and can be acidic, neutral, or basic. Metallic oxides typically conduct electricity, while non-metallic oxides do not.
Oxides are formed by combining oxygen with metals. Oxides are compounds that contain at least one oxygen atom bound to one or more metal atoms. This process is known as oxidation.
Oxides are formed when nonmetals combine with oxygen.
Various nitric oxides are formed.
Oxides are the type of compound that is typically formed when an element is burned in air. Oxides are compounds composed of an element combined with oxygen.