The basic derivatives have been presented in Fig. and 2: [𝜕𝑠(𝑟)/𝜕𝑁] 𝑣 = 𝑠 (𝑟)/𝑆 and the dual descriptor 𝑓 (𝑟) = [𝑑𝑓(𝑟)/𝑑𝑁] 𝑣 for atoms in rows 2 and 3 of the Periodic Table . respectively. ⁄ 𝑣 tend to be flat functions reaching to considerably greater distance than the local softness functions. They all span positive values, except for narrow area near the nucleus, where shallow minima are typically observed (Fig. and Fig. ). This represents the meaningful feature as compared to the dual descriptor, the analogous function that is integrated to zero, hence showing the minima and maxima of equal importance (Fig. and Fig. ). The global values [S/N]v from integration are all positive numbers, typically reaching no more that 30% of the global softness (also positive), except the very light elements (rows 1 and 2), cf. Fig. and Fig. .