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Hace 5 días · Radium is a radioactive chemical element that is the heaviest of the alkaline-earth metals of the periodic table. Radium is a silvery white metal that does not occur free in nature. Its most characteristic property is its intense radioactivity, which causes compounds of the element to display a faint bluish glow in the dark.
- Curie
curie, in physics, unit of activity of a quantity of a...
- Thorium
thorium (Th), radioactive chemical element of the actinoid...
- Actinium Series
actinium series, set of unstable heavy nuclei constituting...
- Uranium
Uranium, radioactive chemical element of the actinoid series...
- Bone Cancer
bone cancer, disease characterized by uncontrolled growth of...
- Curie
Hace 5 días · radon (Rn), chemical element, a heavy radioactive gas of Group 18 (noble gases) of the periodic table, generated by the radioactive decay of radium. (Radon was originally called radium emanation.) Radon is a colourless gas, 7.5 times heavier than air and more than 100 times heavier than hydrogen.
- The Editors of Encyclopaedia Britannica
Hace 3 días · Technetium is a chemical element; it has symbol Tc and atomic number 43. It is the lightest element whose isotopes are all radioactive. Technetium and promethium are the only radioactive elements whose neighbours in the sense of atomic number are both stable.
Hace 3 días · This is a list of radioactive nuclides (sometimes also called isotopes), ordered by half-life from shortest to longest, in seconds, minutes, hours, days and years. Current methods make it difficult to measure half-lives between approximately 10 −19 and 10 −10 seconds.
Hace 5 días · 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 beta form is rhombohedral.
Hace 4 días · The Radium is one of the most radioactive chemical elements (symbol Ra and atomic number 88), 1000 times more radioactive than Uranium. Its most stable isotope, Ra-226, has a half-life of 1602 ...
Hace 4 días · Natural cobalt is all stable isotope cobalt-59, from which the longest-lived artificial radioactive isotope cobalt-60 (5.3-year half-life) is produced by neutron irradiation in a nuclear reactor.
