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Chemistry
Radioactivity
Question | Answer |
---|---|
What is Radioactivity? | Radioactivity is the spontaneous breaking up of a certain unstable nuclei accompanied by the emission of radiation. |
Who discovered Radioactivity? | Henri Becquerel, a French Scientist. |
How did he discover radioactivity? | He did this by exposing crystals of uranium of sunlight on a photographic plate. An image resulted on the photographic plate. He thought the energy from the sun was released. |
What are alpha particles? | Alpha particles are helium nuclei He(2)(4) with a positive charge with a little penetrating ability,can be stopped by a piece of paper. |
What are Beta particles? | They are electrons with a negative charge (-) and are greater penetrating ability. Can be stopped by 5mm Alliminium. |