The on the left side of an equation must be balanced with the atoms on the right side of the equation.

total number of atoms

total number of molecules

total number of compounds

free electrons

Atoms

Explanation:

I would be the total number of atoms. For it to be a balanced equation, there has to be an equal amount of molecules between the reactant and product

wavelength divides in half and speed stays the same.

igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods