In the writing of molecular formulas for covalent compounds, how is more than one atom of an element indicated? -That element is highlighted in yellow.
-A subscript of the number of atoms is added after that element.
-That element's symbol is listed more than once.
-A superscript of the number of atoms is added after that element.

stands for electromotive force and it is measured in volts. despite its name, it is not actually the force in the sense of being a "pushing" or "pulling" (not measured in newtons).an equation that relates emf,  ℰ,  to a battery's terminal voltage, v, current, i, and internal resistance, r, is    ℰ = v + irin this case, the emf can be interpreted as a voltage—a difference in electric potential.i would not say that it would be considered an energy. if emf can be defined as the energy/work per a unit charge from a battery or other electric source, then it is not strictly energy.