thallium$82659$ - ορισμός. Τι είναι το thallium$82659$
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Τι (ποιος) είναι thallium$82659$ - ορισμός

ISOTOPES OF THALLIUM
Actinium D; Thallium-205; Thallium-208; Thallium 208; Thallium-206; Thallium-207; Thallium-176; Thallium-177; Thallium-178; Thallium-179; Thallium-180; Thallium-181; Thallium-182; Thallium-183; Thallium-184; Thallium-185; Thallium-186; Thallium-187; Thallium-188; Thallium-189; Thallium-190; Thallium-191; Thallium-192; Thallium-193; Thallium-194; Thallium-195; Thallium-196; Thallium-197; Thallium-198; Thallium-199; Thallium-200; Thallium-201; Thallium-202; Thallium-203; Thallium-204; Thallium-209; Thallium-210; Thallium-211; Thallium-212; Thallium isotopes; Tl-204; Thallium isotope

Thallous         
  • Crystals of [[hutchinsonite]] ((Tl,Pb)<sub>2</sub>As<sub>5</sub>S<sub>9</sub>)
  • A corroded thallium rod
CHEMICAL ELEMENT WITH SYMBOL TL AND ATOMIC NUMBER 81
Thalium; Tallium; Element 81; Thallous; Thallium-201 stress test; Thallium compounds; Tl (element); Thallium(I); Organothallium; Thallium compound; Compounds of thallium; History of thallium
·adj Of or pertaining to thallium; derived from, or containing, thallium; specifically, designating those compounds in which the element has a lower valence as contrasted with the thallic compounds.
Thallium         
  • Crystals of [[hutchinsonite]] ((Tl,Pb)<sub>2</sub>As<sub>5</sub>S<sub>9</sub>)
  • A corroded thallium rod
CHEMICAL ELEMENT WITH SYMBOL TL AND ATOMIC NUMBER 81
Thalium; Tallium; Element 81; Thallous; Thallium-201 stress test; Thallium compounds; Tl (element); Thallium(I); Organothallium; Thallium compound; Compounds of thallium; History of thallium
·noun A rare metallic element of the aluminium group found in some minerals, as certain pyrites, and also in the lead-chamber deposit in the manufacture of sulphuric acid. It is isolated as a heavy, soft, bluish white metal, easily oxidized in moist air, but preserved by keeping under water. Symbol Tl. Atomic weight 203.7.
Thallium         
  • Crystals of [[hutchinsonite]] ((Tl,Pb)<sub>2</sub>As<sub>5</sub>S<sub>9</sub>)
  • A corroded thallium rod
CHEMICAL ELEMENT WITH SYMBOL TL AND ATOMIC NUMBER 81
Thalium; Tallium; Element 81; Thallous; Thallium-201 stress test; Thallium compounds; Tl (element); Thallium(I); Organothallium; Thallium compound; Compounds of thallium; History of thallium
Thallium is a chemical element with the symbol Tl and atomic number 81. It is a gray post-transition metal that is not found free in nature.

Βικιπαίδεια

Isotopes of thallium

Thallium (81Tl) has 41 isotopes with atomic masses that range from 176 to 216. 203Tl and 205Tl are the only stable isotopes and 204Tl is the most stable radioisotope with a half-life of 3.78 years. 207Tl, with a half-life of 4.77 minutes, has the longest half-life of naturally occurring Tl radioisotopes. All isotopes of thallium are either radioactive or observationally stable, meaning that they are predicted to be radioactive but no actual decay has been observed.

Thallium-202 (half-life 12.23 days) can be made in a cyclotron while thallium-204 (half-life 3.78 years) is made by the neutron activation of stable thallium in a nuclear reactor.

In the fully ionized state, the isotope 205Tl becomes beta-radioactive, decaying to 205Pb, but 203Tl remains stable.

205Tl is the decay product of bismuth-209, an isotope that was once thought to be stable but is now known to undergo alpha decay with an extremely long half-life of 2.01×1019 y. 205Tl is at the end of the neptunium series decay chain.