What are Radioactive Elements? – Lists of Radioactive Elements

Radioactive Elements

This is a list or table of radioactive elements. Keep in mind that all components may have isotopes that are radioactive. It becomes volatile and declines if enough neutrons are added to an atom. An excellent instance is a tritium, a naturally occurring radioactive hydrogen isotope at highly small concentrations. This chart includes the components which do not have stable isotopes. The most stable recognized isotope and its half-life follow each component.

radioactive elements

Radioactive Elements – Where do They Come From?

As a consequence of nuclear fission and through the deliberate synthesis in nuclear reactors or particle accelerators, radioactive components shape naturally.


Natural radioisotopes in stars and supernova explosions may stay from nucleosynthesis. These primordial radioisotopes typically have half-lives as long as they are viable for all practical reasons. But form what is called secondary radionuclides when they decline.

For instance, thorium-232, uranium-238, and uranium-235 primordial isotopes may decline to create secondary radium and polonium radionuclides. is a cosmogenic isotope instance. Because of cosmic radiation, this radioactive element is continuously formulating in the atmosphere.

Nuclear Fission 

Nuclear fission generates radioactive isotopes called fission products from atomic power crops and thermonuclear weapons. Furthermore, adjacent buildings and nuclear fuel irradiation generate isotopes called activation products. A broad variety of radioactive components can lead, which is a component of why it is so hard to cope with nuclear failure and nuclear waste.


The recent component was not discovered in existence on the periodic table. Scientists generate radioactive components in nuclear reactors and accelerators. However, we use various approaches to create fresh components. Besides, sometimes we put the elements inside a nuclear reactor where the response neutrons interact with the sample to create the essential products.

In other instances, a goal with energetic particles is bombarded by particle accelerators. An instance of an accelerator radionuclide is fluorine-18. Furthermore, sometimes it prepares a specific isotope to collect its decline product. For making Molybdenum-99, we use technetium-99 m.

However, sometimes the longest half-life radionuclide is not the most useful or affordable. Some common isotopes are available in small quantities in most countries even to the general public.

Effects of Radioactive Elements

Radioactivity occurs in nature, but if they discover their way into the atmosphere. Moreover, exposure of an organism to radionuclides can trigger radioactive contamination and radiation poison. Also, the sort of future harm relies on the form and produce energy of the radiation. Typically, exposure to radiation creates burns and harm to cells. Radiation may trigger cancer, but after exposure, it may not appear for many years.

Solved Questions for You

Ques-1: Radioactive carbon’s half-life is 5600 years. How long will the activity be decreased to one-quarter after?

  1. 2800 years
  2. 1400 years
  3. 8400 years
  4. 11200 years

Answer: D. 11200 years

Ques-2: When coping with radioactive materials, there are potential risks. What is the right declaration?

  1. Beta-particles can move through the skin and harm the cells of the body. 
  2. Correct Radioactive materials are secure after two half-lives.
  3. It is necessary to keep materials that emit only alpha-particles in dense lead containers.
  4. Because it has a longer half-life, gamma radiation is more hazardous than alpha or beta.

Answer: A. Beta-particles can move through the skin and harm the cells of the body. 

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