Question

what was mendeleevs basis for classification of elements

Answer 1

In 1869, Mendeleev classified the then known 56 elements on the basis of their physical and chemical properties in the increasing order of the atomic masses, in the form of a table. ... Based on this law all the known elements were arranged in the form of a table called the 'Periodic Table'.

Answer 2

Answer:

he arranged elements in the increasing order of atomic masses and similarity in chemical properties (formulae of oxides and hydrides).

• mendeleev arranged all 63  known elements in an increasing order of atomic mass.
• the table contained vertical columns called groups and horizontal rows called periods
• the elements with similar physical  properties and chemical properties come under the same group

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