### chemical elements:

Barium
* absorbs X-rays.
* compounds that dissolve in water can be harmful to human health.
* derives from cesium decay.
* fills the lumen and outlines the serosa of the lesser and greater curvatures.
* forms several other useful compounds.
* hydroxide contains two hydroxide anions.
* increases the refractive index, chemical resistance and hardness of the glass.
* is chemical elements
  - contrast material that is given by enema prior to taking X-rays
  - metal
  - metallic elements
* is part of a group of elements known as the alkaline earth metals
  - an abiotic deposition-dissolution cycle that is activated by organic materials
* occurs in nature in many different forms called compounds
  - naturally in two primary forms, barium carbonate and barium sulfate
* oxidizes in air, reacts vigoroulsy with water to form the hydroxide, liberating hydrogen.
* precipitates quantitatively as the sulfate.
* provides contrast for the x-rays.
* reacts with almost all the non-metals, forming often poisouning compounds
  - water to make barium hydroxide and hydrogen gas
* sulfate occurring in blue, green, brown, and red.
* swallows simple exam, which allows usually the identification of vascular anomalies.
+ Barium, Properties, Chemical properties
  * Barium is reactive, and if you put pure barium metal in the air, it will react with oxygen. At first it will turn black, then white as barium oxide is formed. Barium reacts with water to make barium hydroxide and hydrogen gas. Barium also reacts very fast with acids to make a barium salt and hydrogen. Barium can form barium peroxide if it is burned in air
  - Physical properties: Alkaline earth metals
  * Barium is part of a group of elements known as the alkaline earth metals. It is a silvery metal that easily turns black. It is soft and ductile. It can form alloys with some metals that are partially alloys and partially chemical compounds

### chemical elements | barium:

Barium sulfate
* has some of the same properties as bony material.
* is by nature a heavy compound
  - crystal
  - electrolytes
  - inorganic compounds
  - ionic compounds
  - one of the most insoluble salts of sulfate
  - reduced to barium sulfide by carbon
  - reported to help make paint film harder and tougher
  - taken by mouth or given rectally by enema
  - to be used only by or under the direct supervision of a doctor
  - used as a filler for rubber products, in paint and in linoleum
* is used in soil testing
  - taking X-ray photographs of the intestinal tract
  - to partially fill and open up the colon
* is, in fact, the most common naturally occurring ore of barium.
* precipitate and water is predominantly molecular.
* radiopaque agent.

### chemical elements:

Gallium
* Most gallium produced today is used in electronics.
* arsenide digital integrated circuit design.
* expands as it freezes like water.
* forms a very reflective surface on glass making an excellent mirror.
* interferes with the conversion itself and causes chemical problems when the MOx is used.
* occurs in a trace amount in bauxite and zinc ores.
* reacts with the chalcogens only at relatively high temperatures.
* readilyalloys with most metals, and has been used as a component in low-melting alloys.
* results in an inordinate delay to diagnosis and a larger radiation exposure.
* wets glass and porcelain, forming a brilliant mirror finish on glass
  - or porcelain, and forms a brilliant mirror when it is painted on glass

### chemical elements | gallium:

Solid gallium
* blue-gray metal with orthorhombic crystalline structure.
* is brittle and poorer electrical conductor than lead
  - soft enough to be cut with a knife

Chemical flammability
* A flammability is quality
* Flammabilities are dispositions.
* Flammability chemical property.
* Flammability is determined by the flash point of a material
  - enhanced by the presence of oxidizers
  - the tendency of a chemical to burn