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NEET Chemistry · Classification of Elements and Periodicity in Properties

Modern periodic law and the periodic table

Taught in NCERT Class 11 Chemistry, Chapter 3: Classification of Elements and Periodicity in Properties.

1 verified question: Easy 1 · Medium 0 · NEET level 0

Sample questions

Sample 1Easy

The modern periodic law states that the physical and chemical properties of the elements are periodic functions of their

  1. A

    atomic numbers

  2. B

    atomic masses

  3. C

    equivalent weights

  4. D

    number of neutrons

Show the answer
The answer is A.

Moseley showed that atomic number is a more fundamental property than atomic mass. The modern periodic law therefore states that properties of elements are periodic functions of their atomic numbers.

  • B.

    Periodicity with atomic mass was Mendeleev's law, which the modern law replaced.

  • C.

    Equivalent weight is not the basis of the periodic law.

  • D.

    Neutron number varies between isotopes of one element and does not decide its properties.

NCERT: Class 11 Chemistry, Unit 3 (Classification of Elements and Periodicity in Properties), Modern Periodic Law and the Present Form of the Periodic Table

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