The New Encyclopaedia Britannica
Encyclopaedia Britannica, 1974 - Encyclopedias and dictionaries - 934 pages
 Propaedia: outline of knowledge and guide to the Britannica.--- Micropaedia: ready reference and index.--- Macropaedia: knowledge in depth.
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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, ...
First there is the hydrogen period, consisting of the two elements hydrogen, 1,
and helium, 2. Then there are two periods of eight elements each: the first short
period, from lithium, 3, to neon, 10; and the second short period, from sodium, 11,
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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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review