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technetium
Science; General science
A chemical element, Tc, atomic number 43, discovered by Carlo Perrier and Emilio Segrè in 1937. They separated and isolated it from molybdenum (Mo; atomic number 42), which had ...
tellurium
Science; General science
A chemical element, Te, atomic number 52, and atomic weight 127.60. There are eight stable isotopes of natural tellurium. Tellurium makes up approximately 10 −9 % of the Earth's ...
thorium
Science; General science
A chemical element, Th, atomic number 90. Thorium is a member of the actinide series of elements. It is radioactive with a half-life of about 1.4 × 10 10 years.
titanium
Science; General science
A chemical element, Ti, atomic number 22, and atomic weight 47.90. It occurs in the fourth group of the periodic table, and its chemistry shows many similarities to that of ...
thallium
Science; General science
A chemical element, TI, atomic number 81, relative atomic weight of 204.37. The valence electron notation corresponding to its ground state term is 6s 2 6 p 1 , which accounts ...
thulium
Science; General science
A chemical element, Tm, atomic number 69, atomic weight 168.934. It is a rare metallic element belonging to the rare-earth group. The stable isotope 169 Tm makes up 100% of the ...
vanadium
Science; General science
A chemical element, V, with atomic number 23. Natural deposits contain two isotopes, 50 V (0.24%), which is weakly radioactive, and 51 V (99.76%). Commercially important as an ...
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