Radioactive Material:

Radioactive Material:
When these excess neutron do not upset the balance of the nucleus. Then this new isotope is said to be “ Stable”
When these excess neutrons do upset the balance of the nucleus this isotope is unstable and will disintegrated or decay in to a more stable form.

Unstable Atoms are said to be radioactive.

Some radioactive isotopes are found in nature such as radium and uranium.

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