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.
SOLUTION. 1  Sodium is a metal, and oxygen is a nonmetal; therefore, Na 2 O is expected to be ionic. 2  Both phosphorus and chlorine are nonmetals. 3  The NH 4 in the formula represents the ammonium ion, NH 4, which indicates that this compound is ionic. 4  Both oxygen and fluorine are nonmetals.hen an ionic compound is formed from magnesium and oxygen, the magnesium ion has a 2+ charge, and the oxygen atom has a 2â charge. Although both of these ions have higher charges than the ions in lithium bromide, they still balance each other in a one-to-one ratio.