Question

state modern periodic law write the number of periods and groups ​

Answer 1

Answer:

The modern periodic law related to the periodic table was put forth by Henry Moseley. The law states that "The physical and chemical properties of elements are periodic functions of their atomic numbers." The modern periodic table has 7 periods and 18 groups.

Answer 2

Answer:

Modern periodic law:

The modern periodic law states that the properties of the elements are a periodic function of their atomic numbers.

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