in ascending order by atomic number (number of protons) of an atom of a particular element.
previously, the Periodic Table had elements ordered by atomic mass.
1869 by Mendeleev
Mendeleev organized elements by their atomic mass and properties, arranging them in a table where elements with similar properties were grouped together. Gaps were left for undiscovered elements, allowing Mendeleev to predict the properties of these missing elements based on their position in the table. This led to the development of the first periodic table.
The element named after the man who put the first periodic table together is "Mendelevium." It is named in honor of Dmitri Mendeleev, the Russian chemist credited with creating the first widely recognized periodic table of elements in 1869. Mendelevium is a synthetic element with the atomic number 101 and was first produced in 1955.
Gadolinium is in the middle of the lanthanide sequence on the periodic table. (The lanthanide sequence is the skinny part at the bottom that, in some periodic tables, is put off to the side.)
So people know!
Water and chlorine.
Atomic Number
Dmitri Mendeleev, a Russian scientist of the 19th century, is credited with organizing the periodic table the way we know it today. We have made minor changes to his arrangement over the years (and added a bunch more elements!) but the way he put it together still works.
becuz its an element and thats what the tables made for
Yes they do that is why they are put that way.
Figurative sense - they recorded the periodic table for the advancement of science Literal sense - because paper would be more convenient to carry around?
I know that there are over a hundred but you can't always say because when more elements are discovered they are put on the periodic table on the standard table there are 118,