Canadian Medical Guide > Chemicals and Drugs > Inorganic Chemicals > Elements > Actinoid Series Elements Terms and Definitions




Actinoid Series Elements

Medical Definition: A series of radioactive elements from ACTINIUM, atomic number 89, to and including LAWRENCIUM, atomic number 103.
Guide Notes: GEN: prefer specifics
Previously Indexed: Metals (1966-1975)
Actinoid Series Elements Categories.
Canadian Medical Guide Definition Actinium - Actinium. A trivalent radioactive element and the prototypical member of the actinide family. It has the atomic symbol Ac, atomic number 89, and atomic weight 227.0278. Its principal isotope is 227 and decays primarily by beta-emission.
Canadian Medical Guide Definition Americium - Americium. A completely man-made radioactive actinide with atomic symbol Am, atomic number 95, and atomic weight 243. Its valence can range from +3 to +6. Because of its nonmagnetic ground state, it is an excellent superconductor. It is also used in bone mineral analysis and as a radiation source for radiotherapy.
Canadian Medical Guide Definition Berkelium - Berkelium. A man-made radioactive actinide with atomic symbol Bk, atomic number 97, and atomic weight 247. Its valence can be +3 or +4. Twelve isotopes have been produced with mass numbers 240-251.
Canadian Medical Guide Definition Californium - Californium. A man-made radioactive actinide with atomic symbol Cf, atomic number 98, and atomic weight 251. Its valence can be +2 or +3. Californium has medical use as a radiation source for radiotherapy.
Canadian Medical Guide Definition Curium - A radioactive actinide with atomic symbol Cm, atomic number 96, and atomic weight 247. Thirteen curium isotopes have been produced with mass numbers ranging from 238-250. Its valence can be +3 or +4. It is intensely radioactive and decays by alpha-emission.
Canadian Medical Guide Definition Einsteinium - Einsteinium. A man-made radioactive actinide with atomic symbol Es, atomic number 99, and atomic weight 252. Its known isotopes range in mass number from 243-246. Its valence can be +2 or +3. Einsteinium was originally discovered in the debris from a thermonuclear explosion in 1952.
Canadian Medical Guide Definition Fermium - Fermium. A man-made radioactive actinide with atomic symbol Fm, atomic number 100, and atomic weight 257. Its known isotopes range from 244-254 and 256-258. Its valence can be +2 or +3. Like einsteinium, it was discovered in 1952 in the debris from a thermonuclear explosion.
Canadian Medical Guide Definition Lawrencium - Lawrencium. A radioactive actinide discovered in 1961. It has the atomic symbol Lr, atomic number 103, and atomic weight of 257. There are two isotopes with mass number 257 or 258, and mass number 256.
Canadian Medical Guide Definition Mendelevium - Mendelevium. A man-made radioactive element of the actinide family with atomic symbol Md, atomic number 101, and atomic weight 258.
Canadian Medical Guide Definition Neptunium - Neptunium. A radioactive element of the actinide metals family. It has the atomic symbol Np, atomic number 93, and atomic weight 237.
Canadian Medical Guide Definition Nobelium - Nobelium. A man-made radioactive element of the actinide metal series. It has the atomic symbol No, atomic number 102, and atomic weight 259.
Canadian Medical Guide Definition Plutonium - Plutonium. A naturally radioactive element of the actinide metals series. It has the atomic symbol Pu, atomic number 94, and atomic weight 242. Plutonium is used as a nuclear fuel, to produce radioisotopes for research, in radionuclide batteries for pacemakers, and as the agent of fission in nuclear weapons.
Canadian Medical Guide Definition Protactinium - Protactinium. A radioactive element of the actinide group of metals. It has the atomic symbol Pa, atomic number 91, and atomic weight 231. It decays by alpha-emission.
Canadian Medical Guide Definition Thorium - Thorium. A radioactive element of the actinide series of metals. It has an atomic symbol Th, atomic number 90, and atomic weight 232.04. It is used as fuel in nuclear reactors to produce fissionable uranium isotopes. Because of its radioopacity, various thorium compounds are used to facilitate visualization in roentgenography.
Canadian Medical Guide Definition Uranium - Uranium. A radioactive element of the actinide series of metals. It has an atomic symbol U, atomic number 92, and atomic weight 238.03. U-235 is used as the fissionable fuel in nuclear weapons and as fuel in nuclear power reactors.

Actinoid Series Elements Medical Definitions and Terms

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