Chlorine Element Number 17 Cl

 Spectrum gaseous Chlorine discharge tube.

Liquid Cl2 under 8 atmospheres, sealed in epoxy 

Cl 17 gas,  AW: 35.453  MP: -150.7  BP: - 29.27 D@BP: 1.56

 Chlorine is a Halogen element found below Fluorine on the periodic table. Chlorine is the 21st most abundant element, and in elemental form at room temperature it is a diatomic gas.

Chlorine is another life important element and the compound of Sodium and Chlorine known commonly as table salt. The heart uses needs salt to function. Roman soldiers were partially paid in salt, thus the term "worth your salt"  chlorine is also a deadly poison in pure form and some compounds!

 Household bleach contains Sodium Hypochlorite, which can be used to whiten laundry or kill fungus and bacteria. Elemental Chlorine is used in  paper mills as a bleach, different from household bleach, and can form Organochlorine compounds like dioxins. The term bleach  refers to compounds that can whiten materials, Hydrogen Peroxide, and Calcium Hypochlorite are other common bleaches.

Chlorine has many compounds and most elements will form chlorides, it is reactive as an oxidizer and poisonous. Chlorine gas is used in weapons, and causes painful death. Chlorofluorocarbons are destructive to the ozone layer. Polyvinyl Chloride is used as a popular plastic, used for many applications including drink bottles.

Hydrochloric acid is used in industry for many things, such as rust removal. Various household cleaners like toilet bowl cleaners, contain hydrochloric acid.

Chlorine has an important role in drinking water treatment, as a sanitizer. Chlorine is found in swimming pools and can cause some people a rash reaction.

Argon Element Number 18 Ar

Argon is the 18th element on the Periodic Table, and the 3rd most abundant element in the earths atmosphere. Argon Is a non toxic Nobel gas. Argon can form a few compounds, no surprise with Fluorine. Argon has a number of uses, and is produced using fractional distillation of air.

Some of Argon's notable uses include "Neon lighting", and in welding it is used as inert gas to prevent oxidization of materials, in cryogenics as a cryogen, and also used to preserve materials from oxidation. some materials are created under Argon, such as Germanium crystals, again, to shield from the Atmosphere.

One use of Argon is in Potassium-Argon dating of rocks, because most Argon on earth isotope (Ar40 )is a radiogenic decay product of (K40). The decay process is a result of electron capture or positron emission.  in the Universe Argon is created by stellar nucleosynthesis, Isotope Ar36.

Argon has some use in research, the use of Argon as a scintillation material to find dark matter particles, these particles will cause the Argon nucleus to scintillate. PMT (photo multiplier tube) detectors can pick up this scintillation and can be recorded. I have built  PMT detectors to record scintillations of phosphors and alpha decay particles and run those detectors off a antique CDV-700. I believe my stock CDV 700 Ion tube maybe Argon filled.


This strange glass apparatus  is a vintage Argon sample from Airco, and the left picture is the seal which is not broken

Argon Spectrum gas discharge tube

Ar 18, Gas  AW: 39.948  MP:- 308f  BP:-302