Commutator (electric) A commutator is a moving part of a rotary electrical switch in certain types of electric motors and electrical generators that periodically reverses the current direction between the rotor and the external circuit. It consists of a cylinder composed of multiple metal contact segments on the rotating armature of the machine.
The word equation that would represent the formation of lithium oxide from lithium metal and oxygen is: lithium + oxygen to lithium oxide. In chemical symbols, the balanced chemical equation is expressed as: Li + O2 = Li2O.
It may also be called lithium chlorate (III). The ions present are Li^+ and ClO_2^- The oxidation number of an element is the charge on the atom if the compound was completely ionic. Oxygen is always assigned -2 in compounds (except with fluorine). So in ClOâ2 the 2 oxygens contribute 2 x -2 = -4. Since the net charge on the ion is -1 then chlorine must be +3. The net charge on the ion is the arithmetic sum of the oxidation states i.e +3 - 4 = -1. In Li+ the oxidation state of lithium must be +1.