According to the modern periodic law, the properties of elements repeat at regular intervals when the elements are arranged in order of :

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Decreasing atomic weight

Decreasing atomic number

Increasing atomic weight

Increasing atomic number

answer is C.

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Detailed Solution

The modern periodic law states that the physical and chemical properties of the elements are the periodic function of their atomic numbers and electronic configurations. The elements with the similar properties repeat after certain regular intervals. This repetition occurs if the arrangement of the elements is in order of their increasing atomic numbers.

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