### element | metal:

Thallium
* can be a pollutant if the thallium waste from metal processing is washed away.
* enables a sophisticated scanner to produce pictures of the heart muscle.
* forms a hydroxide in water and is soluble in nitric acid and sulfuric acid.
* is metal
  - odorless, tasteless, and poisonous
  - too expensive to have many practical applications
* occurs in crooksite, lorandite, and hutchinsonite
  - small amounts in almost all living organisms
  - the environment naturally in small amounts
* superconducting films have high transition temperatures.
+ Thallium, Safety: Chemical elements :: Metals
  * Thallium is very toxic. It can be absorbed through skin. Many of its salts easily dissolve. Some are colorless, tasteless, and odorless, but are very toxic. Some think that it is a carcinogen. Thallium can be a pollutant if the thallium waste from metal processing is washed away.

Thicker metal
* is stiffer and therefore it produces a higher pitch in a note with constant measures.
* retains heat better and allows even heat radiation.

### element | metal:

Thorium
* can also form alloys with many other metals.
* is attacked slowly by water.
* is found in several minerals, including thorianite, monazite, and thorite
  - small amounts in most rocks and soils
* is radioactive and can be stored in bones
  - cause health risks when humans are exposed to it in large doses
  - decays at a fixed rate into a series of other elements
  - rather active chemically
  - soluble in acids and reacts slowly with oxygen at room temperature
  - used as an alloying agent to improve magnesium 's strength at high temperatures
* is used in gas lamp mantles and nuclear breeder reactors
  - incandescent gas mantles and in fuel for a few nuclear reactors
  - magnesium alloys and in tungsten filaments for light bulbs and electronic tubes
  - several different ways
  - the glowing mantles in gas lanterns
  - to coat tungsten filaments in light bulbs

Thorium metal
* is silvery and tarnishes black when exposed to air, forming the dioxide
  - used as a stabilizing component of electronic tubes and in magnesium alloys
* source of nuclear power.

### element | metal:

Thulium
* are chemical elements
  - metallic elements
* bright, soft, malleable, silvery-gray metal.
* forms no commercially important compounds.
* has few important uses
  - no biological role but is said to stimulate the metabolism
* is considered to be non-toxic
  - probably the rarest of the lanthanide elements
  - relatively stable in air
  - the least abundant lanthanide on earth except for promethium
* is the least abundant of the naturally occurring rare earth elements
  - rare-earth metals
  - too expensive to have many commercial uses
  - used in color phosphors
* lanthanide element, it has a bright silvery-gray luster and can be cut by a knife.
* occurs in small quantities along with other rare earths in a number of minerals.
* poses no enviromental threat to plants and animals.
* produces an isotope that emits x-rays.
* rare earth metal in the lanthanide series.
* reacts with all the halogens
  - hydrogen chloride to produce hydrogen gas and thulium chloride
* soft malleable ductile and silvery element of the lanthanide series.
* soft, malleable, ductile, lustrous silver-white metal.