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Define radioactivity. Name various radio...

Define radioactivity. Name various radioactive elements.

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Radioactivity : It is the process of spontaneous emission of `alpha,betaandgamma` radiations from the nuclei of atoms during their decay.
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ICSE-SAMPLE PAPER 2011-SECTION-II
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  14. When an alpha particle gains two electrons it becomes neutral and beco...

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  15. Define radioactivity. Name various radioactive elements.

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  16. What happens inside the nucleus that causes the emission of beta parti...

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  17. What happens inside the nucleus that causes emission of beta particle...

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  18. Name a device which is commonly used to convert an electrical signal i...

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  19. The nucleus ""(84)^(202)X emits an alpha particle and forms the nucleu...

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  20. What happens to the mass number and atomic number of an element when i...

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