Q3 of 29 Page 162

Write answers to the following

What is meant by radioactivity?

Elements with a high atomic number such as uranium, thorium, radium have a property of spontaneously emitting invisible, highly penetrating and high energy radiation. This property is called radioactivity.


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1

Fill in the blanks.

A. The number of molecules of water of crystallization in washing soda is _____


B. The chemical name of baking soda is __________.


C. ________ is used in treatment of hyperthyroidism.


D. The chemical name of Teflon is ___________.

 2

Match the pairs

 3

Write answers to the following

When is said to be the nucleus unstable?

 3

Write answers to the following

Which diseases are caused by artificial food colours?