Radioactive Decay and Radioactivity

Radioactive Decay 

Radio activity is the normal nature of radio active molecules. When the nucles are broke this is called radio active decay

Radioactivity

From large nucleas radioactive rays are emitted  this is caled radioactivity. The radio active rays are mainly alpha rays , beta rays, & gamma rays. From which nucleas redioactive rays are emitted is called radio active molicules. Normally grater than 82 atomic number atons are radioactive. Radio activety is very   harmful to human.
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