28.Which of the following is correct about Mendeleev’s Periodic Table? [A] Argon is placed before Potassium [B] Cobalt is placed before Nickel [C] Tellurium is placed before iodine [D] All of the above Show Answer
Mendeleev's periodic table is based on increasing order of atomic weights. It follows the periodic law which states that the physical and chemical properties of elements are a periodic function of their atomic weights.
Mendeleev arranged the elements accordingly to their atomic masses, hence a gap is left on the table for the undiscovered element with an atomic mass between two discovered elements.
