Who developed Modern Periodic law?

Define Modern Periodic Law

How many periods are there in the Modern Periodic Table?

How many groups are there in the Modern Periodic Table?

Compare and contrast the arrangement of elements in mendeleev's Periodic Table and Modern Periodic Table.

How were the position of cobalt and nickel resolved in the Modern Periodic Table?

How were the position of isotopes of various elements decided in the Modern Periodic Table?

Who developed double stranded structure of DNA?

State the modern periodic law. How many groups and periods are present in modern periodic table?