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Charles Janet (French: [ʃaʁl ʒanɛ]; 15 June 1849 – 7 February 1932) was a French engineer, company director, inventor and biologist. He is also known for his left-step periodic table of chemical elements.
The left step table was developed by Charles Janet, in 1928, originally for aesthetic purposes. That being said it shows a reasonable correspondence with the Madelung energy ordering rule this being a notional sequence in which the electron shells of the neutral atoms in their ground states are filled.
A periodic table in which each row corresponds to one value of n + l (where the values of n and l correspond to the principal and azimuthal quantum numbers respectively) was suggested by Charles Janet in 1928, and in 1930 he made explicit the quantum basis of this pattern, based on knowledge of atomic ground states determined by the analysis of ...
Naturally, other forms of period 1 can be drawn when describing the dispute, or in drawing alternative periodic tables that take different positions. For example in Charles Janet's periodic table helium should certainly be in group 2 (because that is how Janet drew it).
Mazurs provided a comprehensive analysis and classification of periodic tables, listing and classifying over 700 periodic tables. [3] He recommended Charles Janet 's left-step system and suggested that it could be expanded into three dimensions.
This form of periodic table is congruent with the order in which electron shells are ideally filled according to the Madelung rule, as shown in the accompanying sequence in the left margin (read from top to bottom, left to right). The experimentally determined ground-state electron configurations of the elements differ from the configurations ...