The mass of the elements
Mendeleev used atomic mass to arrange periodic table.He gave his model in 1869.
atomic weight
The periodic table used to be arranged by increasing atomic mass. Now, it is arranged by increasing atomic number (number of protons in an atom of element).
Mendeleev arranged the elements in the periodic table according to their atomic masses.
Atomic weight
Atomic number on the basis of Modern periodic law as on the view of Henry Mosely
The periodic table can be used to quickly determine characteristics (number of valence electrons for example) of an element.
the periodic table has no compounds it is a table of elements.
Periodic Table is expressed as rows and columns. It is used by locating the position of element.
Periodic table is expressed as rows and columns. It is used by locating the position of element.
The "Periodic Table of Elements" is used for classifying the elements, and to know which one is which.
The periodic table reflects real and useful ways to categorize the elements according to some basic characteristics within groups.