Explain accidental discovery of radioactivity

Answer the following question: Define radioactivity: What are radioactive substances? Name the scientist who discovered radioactivity.

What is meant by radioactivity?

Explain briefly the discovery of Nucleic acids.

Explain Isolation

In the textbook you came across Three Mile Island and Chernobyl disasters associated with accidental leakage of radioactive wastes.In India we had Bhopal gas tragedy. It is associated with which of the following ?

Explain nanomaterials

Explain in detail radioactive pollution.

Explain Osmosis

Explain Kinetic Friction.

Among the alkaline earth metals which one is radioactive