The periodic table presents all the elements known so far, which are organized and located according to their characteristics and relationship between them in groups, periods, blocks and metals, metalloids and non-metals.
It is composed of 118 elements confirmed by the International Union of Pure and Applied Chemistry (IUPAC), of which
* 94 are elements that exist in nature, and
* 24 elements are synthetic, that is, they have been created artificially.
The periodic table is made up of 18 groups of elements arranged in vertical columns, numbered 1 to 18 from left to right, beginning with the alkali metals and ending with the noble gases. In the following image you can see how the groups are ordered:
The elements that belong to the same column have similar chemical characteristics, based on how the electrons in the last layer of the atom are structured.
You can check all the elements and their properties in the following link from the royal society of chemistry:
