What are isobars? Give one example.

Name the atoms of a substance having same atomic number, but different mass numbers. Give one example of such a substance. How do the structures of such atoms differ?

A radioactive substance is oxidized. What changes would you expect to take place in the nature of radioactivity? Explain your answer.

Explain why α and β particles are deflected in an electric or a magnetic field, but γ rays are not deflected in such a field.