M+ (O2)-2
La unión –O-O- es denominada grupo peróxido.
El metal funciona con su valencia positiva y se la “pasa” al hidrógeno.
El grupo peróxido por su parte le “pasa” su valencia -2 al metal.
M[-2](O2)[+]
Nota importante: Cuando los números en los subíndices resultantes son múltiplos, se realiza la operación denominada simplificación, que consiste en dividirlos por el mínimo común divisor, hasta que dejen de ser múltiplos o hasta que el resultado sea 1.
Los peróxidos solo se forman con los siguientes metales de la primera y segunda familias.
Para nombrar estos compuestos:
Ejemplos:
- Nombrando los compuestos:
Na2O2 ……….. Peróxido de sodio
BaO2 ……….. Peróxido de bario
- Escribiendo las fórmulas:
Peróxido de potasio ………. K2O2 (No se simplifica pues el 2 del oxígeno corresponde a la unión –O-O-)
Peróxido de calcio ………. Ca
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