Question

What are radio active elements? Name some of them.

Answer 1

An element subject to spontaneous degeneration of its nucleus accompanied by the emmision of alpha particles,beta particles,or gamma rays.

thorium
curium
uranium
radon
technetium

are some examples.

hope it helped :)

Answer 2

radioactive element. an element subject to spontaneous degeneration of its nucleus accompanied by the emission of alpha particles, beta particles, or gamma rays. All elements with atomic numbers greater than 83 are radioactive. Naturally occurring radioactive elements include radium, thorium, and uranium.