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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, ...
The long-period form of the periodic system of the elements, presented here in
two forms, Figures 3 and 4, contains all of the chemical elements that have been
discovered or made; Periods they are arranged, in the order of their atomic ...
The extended period of adolescence means that the young remain under adult (
primarily maternal) surveillance for a long period, during which time the juvenile
acquires, by example from its mother and peers, the knowledge that will allow it
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The New Encyclopaedia Britannica (Encyclopaedia)User Review - Not Available - Book Verdict
For virtually all its 238 years,Britannica has ruled the shelves as a peerless general encyclopedia. Reviewers have consistently given it high marks for most of the 12 criteria identified inKister's ... Read full review