M+ O-1/2
El metal (K, Rb, Cs, Na, Ca, Cd, Mg) funciona con su valencia positiva.
Por lo anterior, la fórmula general de los superóxidos es:
M[1/2]O[+]
Para que los subíndices sean números pares, multiplicamos ambos por 2, teniendo como resultado, la siguiente fórmula general:
M O2*[+]
Para nombrar estos óxidos, usando la denominación de superóxido o hiperóxido:
Ejemplos:
- Nombrando los compuestos:
MgO4 …………… Superóxido de magnesio
- Escribiendo las fórmulas:
Superóxido de cesio ………… Cs1/2O ----> CsO2
Superóxido de calcio ……….. Ca1/2O2 ----> CaO4
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