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Q.

The basis of modern periodic law is

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a

atomic size

b

atomic volume

c

atomic number

d

atomic mass

answer is A.

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Detailed Solution

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According to the Modern periodic law , the properties of the element and their compounds  are a periodic function of their atomic numbers . When elements are placed according to atomic number , then similar electronic configuration are repeated after regular interval . Hence elements are placed in periodic table according to in increasing atomic number,Z.

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