Which atomic property did Dmitri Mendeleev use to organize his periodic table?

Dmitri Mendeleev used the atomic mass (or relative atomic mass) of elements to organize his periodic table.

Dmitri Mendeleev organized his periodic table based on the atomic mass of elements.

Dmitri Mendeleev used the atomic mass to organize his periodic table. He arranged the elements in order of increasing atomic mass and observed that the properties of the elements repeated periodically according to their atomic masses. This arrangement allowed him to predict the properties of missing elements and led to the development of the modern periodic table.

If you want to find out the atomic mass of an element, you can typically look it up in a periodic table. You can find a periodic table in various science textbooks, reference books, or on the internet. Each element in the table is usually accompanied by its atomic symbol and atomic number. The atomic mass is typically listed below the element's symbol or within its cell in the periodic table.