Question

What are the defects of Mendeleev's periodic table?​

Answer 1

Explanation:

• Position of hydrogen in the periodic table was not correctly defined.

• Position of hydrogen in the periodic table was not correctly defined.In certain pair of elements the increasing order of atomic masses was not obeyed. Isotopes have not been given separate places in the periodic table.

• Some similar elements were separated and dissimilar elements were grouped together.

• Mendeleev could not explain the cause of periodicity among the elements.

Answer 2

Answer:

it can't define the position of hydrogen.