What Is the Most Radioactive Element? - ThoughtCo
May 8, 2019 · Because it is a naturally-occurring element that releases a huge amount of energy, many sources cite polonium as the most radioactive element. Polonium is so radioactive it glows blue, which is caused by excitation of the gas particles by radiation.
A List of Radioactive Elements - ThoughtCo
Jun 7, 2024 · This is a list or table of elements that are radioactive. Keep in mind, all elements can have radioactive isotopes. If enough neutrons are added to an atom, it becomes unstable and decays. A good example of this is tritium, a radioactive isotope of hydrogen naturally present at extremely low levels.
Polonium - Wikipedia
Polonium is a radioactive element that exists in two metallic allotropes. The alpha form is the only known example of a simple cubic crystal structure in a single atom basis at STP (space group Pm 3 m, no. 221). The unit cell has an edge length of 335.2 picometers; the …
Uranium - Wikipedia
Uranium is a chemical element with the symbol U and atomic number 92. It is a silvery-grey metal in the actinide series of the periodic table. A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons. Uranium radioactively decays, usually by …
What Are the Radioactive Elements? - Science Notes and Projects
Sep 9, 2019 · This is a list of the radioactive elements and their most stable isotopes. While many of these elements have half-lives so long they almost appear stable, the heavier elements decay almost instantly. Element. Most Stable. Isotope.