Radioactivity and What is radioactive substances ?

Radio-Activity

What is radioactive substances?
Substances which emits radiation by there self are known as radioactive substances.
What is radioactivity?
Phenomenon of radioactive substances to emits radiations is known as radioactivity.
What is importance of radioactivity?
Radioactive substances (or radioactive isotopes of elements) are useful in many physical and chemical reactions. Useful in determining complex reaction mechanism. Radioactivity have several applications in different fields of science like chemical science, medical science, agriculture fields, industrial fields etc.

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