Group 7 of the periodic table is something of an oddity. When the first periodic table was formulated by Mendeleev, it was the only group that contained just a single known element — manganese.

However, he is remembered for his search for a pattern in inorganic chemistry. Just four years before Mendeleev announced his periodic table ... These elements were almost entirely main group elements ...

The laws of chemistry Mendeleev (1834-1907 ... Elements with similar properties are arranged to form columns (groups). The periodic table is now a thing of both beauty and practical use, says ...

Now, IUPAC, the International Union of Pure and Applied Chemistry ... Because element 118 falls within group 18 of the periodic table, it is a noble gas, with a particular naming pattern.

But the logic of the periodic table also relies upon the number and organisation of electrons in an atom. Let’s take chlorine as an example. It is positioned in group 7 of the periodic table ...

At the time, no modern organic chemistry textbooks in the Russian ... Elements that occupy the same column on the periodic table (called a "group") have identical valence electron configurations ...