Q. Mendeleef’s Periodic Table is upset by the fact that
A) Many elements has several isotopes
B) Noble gases do not form compounds
C) Some groups stand divided into two sub groups $A$ and $B$
D) Atomic weights of elements are not always whole numbers
Explanation
(a)
Mendeleef failed to assign positions to isotopes on the basis of atomic mass according to his periodic law
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.