2. Radioactivity By Naeema, Anum, Tanzeela and Shomaila

3. What is radio-activity?

4. Definition Radioactivity is the spontaneous disintegration of nucleus of an atom and emission of invisible rays from the nucleus of an atoms.

5. Discovery of radio-activity In 1898, a French physicists Henry Becquerel discovered the process of radioactivity.

6. Radioactive elements The substances which emit radiation from their nuclei are known as “radioactive elements”.

7. Radioactive rays There are three types of radioactive rays. Alfa-ray (have positive charge) Beta-ray (have negative charge) Gamma-ray (have no charge/ neutral)

8. Uses of radioactivity Radioactivity is used in Weapons Explosive materials Researches Medical science

9. Example of radioactive elements UraniumPlatinumRadiumPoloniumActiniumThorium

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