The characteristic feature of the ∆𝑁(∆𝑍) relationship represented by its slope for the limit of ∆𝑍 → 0 was found to be unique for every orbital ∆𝑁 ∆𝑍 ⁄ → 3 a. u. The results for actual atoms were found reasonably close to this prediction. ∆𝑁 ∆𝑍 ⁄ = 𝐴 𝑁 (Table ), with 2.62<AN<2. 86 [a. u.]. The difference could be attributed to the effect of electron-electron interaction, as the prediction for orbitals was for single occupied orbitals only.