Comparison of SDL and LMC measures of complexity: Atoms as a testbed

The simple measure of complexity Γα,β of Shiner, Davison and Landsberg (SDL) and the statistical one C, according to López-Ruiz, Mancini, and Calbet (LMC) are compared in atoms as functions of the atomic number Z. Shell effects i.e. local minima at the closed shells atoms are observed as well as similar qualitative trends of Γα,β(Z) and C(Z). It is conjectured that the above conclusion does not depend on the specific definition of complexity measure. This corroborates our previous finding that atoms cannot grow in complexity as Z increases.