Question

what is a periodic table and how does it work and hwta is it for

Answer 1

The periodic table is a tabular arrangement of about 118 elements, ordered by their atomic number, electron configuration, and recurring chemical properties, whose structure shows periodic trends. 

The organization of the periodic table can be used to derive relationships between the various element properties.

The table’s groups are the 18 vertical columns that run from left to right. 
The table’s periods are the top seven horizontal rows on the grid running top to bottom, and partner elements across the groups that share similarities in their properties.

because of the importance in the classification system of the number of electrons in each element’s outer shell, the table is also broken down into four main blocks, dependent on the atomic orbital type of each element’s highest energy electrons. These are s, p, d and f-blocks respectively, and can be seen in the table, each separated by a colour change.

Answer 2

a period table is which there are 118 elements there are 4 blocks s-block,p-block,f-block,d-block the f-block is at the bottom there are lanthenide and actinide