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.
The Reaction between Magnesium and Oxygen. Magnesium is in group 2 of the periodic table. A magnesium atom will lose 2 electrons to form a stable 2+ ion. Oxygen is in group 6 of the periodic table.An oxygen atom will gain 2 electrons to form a stable 2- ion. In this example the electrons are shown as dots and crosses.agnesium is in group 2 of the periodic table. A magnesium atom will lose 2 electrons to form a stable 2+ ion. Oxygen is in group 6 of the periodic table. An oxygen atom will gain 2 electrons to form a stable 2- ion. In this example the electrons are shown as dots and crosses.