JEE Main Chemistry question

Mendeleef's Periodic Table is upset by the fact that

(A)Many elements has several isotopesCorrect
(B)Noble gases do not form compounds
(C)Some groups stand divided into two sub groups and
(D)Atomic weights of elements are not always whole numbers

Answer: (A)

Solution

Mendeleev's table was built on increasing atomic mass, but the existence of isotopes (atoms of the same element with different masses) meant atomic mass could not serve as a logically consistent, unique ordering criterion — a problem only resolved by Moseley's atomic-number-based Modern

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Question ID VK-133236