Question

Write modern periodic law. How many groups and periods are there in modern periodic table​

Answer 1

Answer:

The modern Periodic law can be stated as: “The physical and chemical properties of the elements are periodic functions of their atomic numbers”.

no.of groups =18

no.of periods =7

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Answer 2

Answer:

1. modern periodic law states properties of element are periodic function of their atomic number.
2. There are 18 groups and 7 periods in modern periodic table