Growing of nails is a periodic change. Why?

Boiling of water is a physical change, but boiling of egg is a chemical change. Why?

True or False - If False give the correct answer : If the chemical properties of a substance remain unchanged and the appearance or shape of a substance changes it is called a periodic change.

True or False - If False give the correct answer : Cutting of cloth is an example of a periodic change.

_________ is an example of a periodic change.

State two examples of periodic changes.

Is solar eclipse a periodic change? Give your reason.

Forest fire : _________ change: : Change in period in a school : Periodic change

What is meant by 'diagonal relationship' in periodic table? Why is it so?

How does electron affinity change when we move from left to right in a period in the periodic table ?