(A) Mendeleev's periodic law states that the properties of elements are a periodic function of their $atomic \ mass$. In contrast,the modern periodic

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Mendeleev's law is based on atomic mass,while the modern law is based on atomic number.

(A) Mendeleev's periodic law states that the properties of elements are a periodic function of their $atomic \ mass$. In contrast,the modern periodic law states that the physical and chemical properties of elements are a periodic function of their $atomic \ number$.

Class 11 Chemistry Classification of Elements and Periodicity in Properties History of periodic table

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What is the fundamental difference between Mendeleev's periodic law and the modern periodic law?

A
Mendeleev's law is based on atomic mass,while the modern law is based on atomic number.
B
Mendeleev's law is based on atomic number,while the modern law is based on atomic mass.
C
Both are based on atomic mass.
D
Both are based on atomic number.