In Mendeleev's period table, the elements were arranged by both weight and valence. Mendeleev noticed certain elements were very close in weight and properties and hypothesized other elements that would lie between them. These were the basis of groups. He also noticed weights increased regularly and formed these into periods.
They used atomic number instead of Atomic Mass to organize the elements
To understand the concept of Periodic Table
In Mendeleev's period table, the elements were arranged by both weight and valence. Mendeleev noticed certain elements were very close in weight and properties and hypothesized other elements that would lie between them. These were the basis of groups. He also noticed weights increased regularly and formed these into periods.
bi and po
In Mendeleev's periodic table, the elements were arranged in the increasing order of their atomic masses and repeating periodic properties.
they changed the 3 new Elements.
elements
The periodic table was created by chemists, specifically Dmitri Mendeleev in 1869. Mendeleev organized the elements based on their properties and atomic weights to create a system that displayed the periodic trends of elements.
Chemists
Periodic table group elements with similar properties together. It makes study of elements easier for chemists.
Sodium Chloride ,which is capital I in the periodic table, is what "chemists" call salt.
Mendeleev predicted that properties of elements are periodic function of atomic mass. He demonstrated it by creating a table.