It is useful so they can create more scientific elements
Chemists consider the Periodic Table useful is because it gives information to the atomic number, the average Atomic Mass, The chemical symbol, a general knowledge to valence electrons, basic knowledge that can be used to determine ions, the ability to determine metals, halogens, noble gases, alkalines, nonmetals, etc and this is all just at arm reach.
They don't use them not so many times any more because they know the 'principle' and (more important) they know what they can do with it, without the black magic of semi-chemists.
Short: the use is exaggerated by a lot of people, even teachers. It is a nice table for looking up some facts, but more is in other (simpler) tables.
Chemists and students use the periotic table as a reference tool.
Scientists created periodic table to make study of elements easier. it helps in easy classification.
Chemists....
Periodic table help to estimate the chemical and physical properties of elements.
as a reference tool
These are called periods. Although some chemists simply call them rows.
Dimitri Mendeleev is credited with the the creation of the first modern and rational periodic table of chemical elements; but other chemists also had contributions.
Chemists....
The periodic table is very useful.
Chemists
Periodic table group elements with similar properties together. It makes study of elements easier for chemists.
How have chemists used the Periodic Table over time
By grouping the elements on the Periodic Table.
What to use instead of the periodic table.
Periodic table help to estimate the chemical and physical properties of elements.
as a reference tool
Sodium Chloride ,which is capital I in the periodic table, is what "chemists" call salt.
one of them is dmitri mendeleev
Chemical elements are organized in the periodic table of Mendeleev.