Question

write the morden periodic law ,

Answer 1

Physical and chemical properties of elements are the periodic function of their atomic number.

This is modern periodic law which was given by Henry Moseley.

Answer 2

the law that the properties of the elements are periodic functions of their atomic number. Also called MENDELEEV's law. the statement that chemicals and physical properties of the elements recur periodically when the elements are arranged in the order of their atomic weights .It is developed by Dmitri Mendeleev and Lothar Meyer in 1869 .Mendeleev created the first periodic table and was shortly followed by Meyer.