Question

What were the two criteria used by Mendeleev in his periodic table?

Answer 1

Mendeleev's periodic table:

• Mendeleev arranged the elements in vertical columns and horizontal rows.
• He included all the elements in his table discovered at that time and also left space for the undiscovered elements.

Criteria of Mendeleev's periodic table:

• He arranged the elements in the increasing order of atomic masses.
• He placed the elements with similar properties in the same group.