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The phrase “periodicity in the properties of elements” means that when elements are arranged in the increasing order of their atomic number, elements with similar nature

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repeat after a fixed interval

repeat after certain regular interval

present diagonally

form horizontal rows

answer is B.

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Detailed Solution

Consider the elements Li, Na, K, Rb and Cs. The difference in their atomic numbers is 8, 8, 18 and 18 respectively. Thus elements with similar properties repeat at regular intervals.

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