Question

Mendeleeff's periodic table is based on

• A. atomic weight
• B. atomic size
• C. atomic number
• D. atomic volume

Answer 1

The Correct Option is A

Dmitri Mendeleev arranged elements in his periodic table in the order of increasing atomic weights. He also grouped elements with similar chemical properties together, which led to some elements being placed out of strict atomic weight order to preserve the pattern. Later, Modern Periodic Law replaced atomic weight with atomic number, but Mendeleev's table was originally based on atomic weight.

The correct answer is option (A): atomic weight