Periodic table
The periodic law discovered by D. I. Mendeleev was expressed in the table. Periodic table of chemical elements, or periodic table.
Periodic Table
s
p
d
f
1
18
3
3
4
5
6
7
8
9
10
11
12
4
5
6
﹡
7
﹡
﹡6﹡
In the periodic table, columns are called groups, rows are called periods. The elements in the groups, as a rule, have the same electronic configurations of the outer shells, for example, noble gases - the last group, have a complete electronic configuration.
How the electronic configuration of the elements is filled is described in detail in the article
