Artifical radioactive element are present in:

Synthetic radioactive elements present in actinides are

The half life period of a radioactive element is 90 minutes. What percentage of radioactive element will be present after 6 hours of decomposition ?

How long will it take for 75% of the atoms of a certain radioactive element, originally present to disintegrate ? The half-life of the element is 10 days.

Common radioactive elements present in human body are

Common radioactive elements present in human body are

Radioactive element of group 17 is

Radioactive element of group 17 is

The artificial (or) induced radioactive element is