The three common chromium oxides are , , and . If is amphoteric, what can you say about the acid-base properties of and has to be explained.
Oxides of metals and non-metals may be,
Acidic-exhibits acidic character
Basic-exhibits basic character
Amphoteric-exhibits both acidic and basic character
Neutral-does not exhibit any of the acidic or basic character
Order of Basicity:
The basicity of metal oxides depends on the oxidation number of the metal ions.
The most basic oxides occur with metal ions having the lowest positive charges (or lowest oxidation numbers).
Metallic compounds in which the oxidation numbers of the metals are low are more ionic than those in which the oxidation numbers of the metals are high
Metal ions with high oxidation numbers are unstable.
Consequently, these metals tend to form covalent bonds (rather than ionic bonds) with oxygen.
To Explain: The acid-base properties of and