In eq. ( ) 𝑉 )) and 𝐸 !! are the electrostatic repulsions between nuclei and electrons, respectively. Equation ( ) is exact within the Born-Oppenheimer approximation, and all its terms can be evaluated quantum-mechanically, at various levels of theory, as well as be estimated experimentally through a combination of techniques. For example, the value of 𝜒 #$% can be experimentally estimated as an average of photoionization energies of valence levels, or be approximated by averaging the energy of occupied valence orbitals. Because of the possibility of interchangeable use of both experimental and computed data, we refer to eq. ( ) as an Experimental Quantum Chemistry (EQC) energy decomposition scheme. There is no unique way to decompose energies and several other elegant methods exist to do so (e.g., see Refs. 78-101). EQC energy terms have been successfully used to, for example, classify chemical bonds in diatomic molecules and small hydroxides, 102 for distinguishing red-and blue-shifted hydrogen bonds, 103 and for estimating substituent effects in benzoic acids. In what follows, we develop upon the EQC framework to address its relationship with the chemical potential. As we do so, we will prove why, with our definition, electronegativity equilibrates within molecules rather than equalizes. We begin by exploring an expression of the chemical potential that connects to the notion of electronegativity in a new way.