Electron energy derived basins allow for the subsequent calculation of atomic properties inside materials. For example, the electron energy 𝛸 7 attributed to an atom can be evaluated by integrating 𝛸(𝒓) over the basins 𝛺 7 . In what follows, we will use this electron energy-based definition of atoms inside materials to study three atomic (or ionic) properties: volumes 𝑉 7 , partial charge 𝑞 7 and what we call in-situ electronegativity, 𝜒̅ 7 89: . 1