Farha wondered "How it could be possible for Nature to bring changes in seasons periodically". Can you add some changes like this ? How will you explain them ?

Can you name some changes which form new substances ?

How does the acidic or basic nature of oxides change in a period?

How does atomic radius vary in a period and in a group? How do you explain the variation?

How does atomic radius vary in a period and in a group? How do you explain the variation.

How can you say that your backbone behaves like a spring?

The calculated electron gain enthaly values for alkaline earth metals and noble gases are positive . How can you explain this ?

Sita wondered and felt very happy to see the beauty of the fields and insects like twinkling beetle (glow-worm) during rainy season in their village. Can you list some such changes which make you wonder and feel happy?

How do the positions of elements in the periodic table help you to predict its chemical properties ? Explain with and example .

“In winter season water vapour gets cooled and changes into tiny droplets and smoke”- how will you appreciate this Natural Phenomenon?