Question

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Explain the defects of Modern periodic table .

Class - 10th
Chapter - Periodic classification of elements.

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Answer 1

Answer:

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According to Mendeleev's Periodic Law, isotopes of an element must be given separate places in the periodic table because they have different atomic masses. It does not explain the electronic arrangement of elements. Elements that are chemically similar such as Gold and Platinum have been placed in separate groups.

Answer 2

Answer :

Defects of Modern periodic table are :

★ This classification is based on the atomic number which is more fundamental property of the elements.

★ Since this classification is based on the atomic number and not on atomic mass, the position of placing isotopes at one is fully justified.

★ It is easy to remember and produce.

★ The position of some elements which were misfit on the bass is of atomic mass is justified on the basis of atomic number.

• For example : Argon precedes potassium because argon has atomic number 18 and potassium has 19.

★ The position of hydrogen is not settled. It resemble with alkali metals as well as halogens. However it has been placed in alkali metals.