oxideionen
Oxideionen, also known as oxide ions, are chemical species consisting of an oxygen atom that has gained one or two electrons. This results in a negatively charged ion, with the chemical formula O^2- for the most common form, oxide. A less common form, the superoxide ion, has the formula O2- and is a diatomic ion.
Oxide ions are fundamental building blocks in a vast array of chemical compounds, particularly ionic compounds
The stability of the oxide ion is due to the high electron affinity of oxygen. The gain