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Question

Assertion :The placement of isotopes in Mendeleev's periodic table overcome in the modern periodic table. Reason: In modern periodic table, the elements have been allotted places based on their atomic numbers

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
All the isotopes of an element have same atomic numbers.

In modern periodic table, the elements have been allotted places based on their atomic numbers.

Therefore, all the isotopes of an element have been assigned the same position in the modern periodic table.

Option A is correct.

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