With reference to long form of the periodic table fill in the blank spaces with appropriate words.
The chemical properties of elements are a periodic function of their ________.

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Solution

Long form of periodic Table: In the long form of the periodic table, elements are arranged in the order of their increasing atomic number in the tabular form.
It has 18 vertical groups or columns and 7 horizontal rows or series.
The long form of periodic table follows modern periodic law.
Modern periodic law: When elements are arranged in the order of their increasing atomic number, the elements with similar properties are repeated after a certain regular interval.
This is in contrast to Mendeleev's periodic table in which the chemical properties of elements was a periodic function of their atomic masses.
Therefore, the chemical properties of elements are a periodic function of their atomic number.

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