Question

20. State modern periodic law​

Answer 1

Answer:

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Explanation:

Modern periodic law states that the physical and chemical properties of elements are the periodic functions of their atomic number.  

There are 18 groups and 7 periods present in the modern periodic table.

Answer 2

Answer:

The modern periodic law states that the physical and chemical properties of the elements are the periodic functions of their atomic numbers. Scientists arranged elements in increasing order of their atomic numbers from left to right across each row.

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