Mendeleev's first periodic table (1869) included just five rare earth elements. This article traces the discovery and isolation of the rare earths—scandium, yttrium and the lanthanides—a process that extended until 1947, as well as the efforts to locate them in the periodic system. The ...
Describe the bug from mendeleev.fetch import fetch_table from mendeleev.db import get_session, get_engine df = fetch_table('elements') AttributeError: 'OptionEngine' object has no attribute 'execute'
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This paper gives a survey for the methods how a possible upper limit in Mendeleev's Periodic Table can be found. It is show, only the method of hyperbolas leads to exact answering this question.Albert KhazanHEXIS (Arizona)progress in physics...