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'Lanthanum and the lanthanons Figure 1: Short-period form ot periodic system of
elements. Thomsen in 1895 devised a new table. This was interpreted in terms of
the electronic structure of atoms by Niels Bohr in 1922. In this table, Figure 2, ...
MHa| "M Figure 2: Periodic system of elements with periods demarcated by noble
gases. Cs Ba La Ce Pr Nd Pm Sm Eu Gd Tb 55 56 57 58 59 60 61 62 63 64 65 Fr
Ra Ac Th Pa 87 | 86 I 89 | 90 | 91 Np Pu Am Cm Bk Cf Es Fm Md No Lr Rl 93 ...
Vila Figure 4: A modern version of the periodic table of elements. Figure 1),
however, it is customary to describe them as constituting 15 subgroups, the three
consecutive elements iron, cobalt, and nickel and their congeners in the
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