Question

what is radioactivity and radioactive elements? give 4 example of radioactive elements​

Answer 1

Answer:

Radioactive elements are not stable naturally

They need specific conditions and they are not natural they are man made

Answer 2

Answer:

Explanation:

Radioactivity, property exhibited by certain types of matter of emitting energy and subatomic particles spontaneously. ... It is, in essence, an attribute of individual atomic nuclei.

Radioactive elements are made up of atoms whose nuclei are unstable and give off atomic radiation as part of a process of attaining stability. The emission of radiation transforms radioactive atoms into another chemical element, which may be stable or may be radioactive such that it undergoes further decay.

4 example of radioactive elements​ are:

Astatine  

Radon

Francium

Radium