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

How many periods are there in the Modern Periodic Table?

Define Modern Periodic Law

How many groups are there in the Modern Periodic Table?

What is time period?

Who developed Modern Periodic law?

Mention the period of tan2x .

State modern periodic law. What do you understand by first ionization potential? "The first ionization energy of nitrogen atom is greater than that of oxygen atom" Explain

How many microtubules are present in the peripheral fibrils of : cilia