Chemists....
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 and Physicists would wonder why not, as there would be a hole in the periodic table where it belongs.
Chemists....
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.
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.
the answer is calendar
Many modifications were done. Finally moseley's periodic table was accepted.