Argon

=Argon (Ar)=


 * Name:** Argon
 * Symbol:** Ar
 * Atomic Number:**18
 * Atomic Mass:** 39.948 amu
 * Melting Point:** -189.3 °C (83.85 K, -308.74 °F)
 * Boiling Point:** -186.0 °C (87.15 K, -302.8 °F)
 * Number of Protons/Electrons:** 18
 * Number of Neutrons:** 22 **C**
 * lassification:** Noble Gas
 * Crystal Structure:** Cubic
 * Density @ 293 K:** 1.784 g/cm 3
 * Color:** Colorless Gas
 * Ionization Energy:** 15.760 eV

Argon is a by product of the production of O 2 and N 2

argon is a very high energy leveled chemical compound

Atomic Structure

 * ||  || **Number of Energy Levels:** 3
 * First Energy Level:** **Second Energy Level:** **Third Energy Level:** ||

Isotopes

 * ** Isotope ** || ** Half Life ** ||
 * Ar-36 || Stable ||
 * Ar-37 || 35.0 days ||
 * Ar-38 || Stable ||
 * Ar-39 || 269.0 years ||
 * Ar-40 || Stable ||
 * Ar-41 || 1.8 hours ||

Facts

 * Date of Discovery:** 1894 **Discoverer:** Sir William Ramsay **Name Origin:** From the Greek word //argon// (inactive) **Uses:** Lighting **Obtained From:** air

Characteristics of Argon
Argon is colorless, odorless, and non-toxic as a solid, gas or liquid. **B**ut as a gas it can produce a violet color when it crosses an electric field with a high voltage. Because of this ability to glow, Argon is commonly found in incandescent lighting. Inert under most conditions and forms. Argon is considered a noble gas, meaning that it's outer valence is full with electrons. Moreover, since Argon is the most abundant noble gas in nature and it is also the first noble gas that has ever been found by human. This causes it to be a less reactive element because it's outer shell is already full. This is actually where Argon gets it's name, from a Greek root meaning "lazy" or "the inactive one".

However, it has been found to have the capabilities of forming some compounds: - Creation of argon flourohydride Agron containes ions and excited state complexes - ArH + - ArF

Argon is a colorless gas, but can produce a violet color when it crosses an electric field with a high voltage. Because of this ability to glow, Argon is commonly found in incandescent lighting.

**History of Argon** Was first discovered by Henry Cavendish in 1785, but not successfully separated until 1894 by Lord Rayleigh and Sir William Ramsay, which occurred in Scotland. Theses 2 men concluded, after vast experimentation, that there was another gas in the air mixed along with nitrogen. Independent research was conducted by H. F. Newall, and W. N. Harley. Argon them became the first member of the noble gasses to be discovered, and after more was found out about Argon, its symbol was changed to Ar, but up until 1957, it was just known as A.

Argon is obtained from the air as a byproduct of the production of oxygen and nitrogen. Argon is the third most common gas in the earth's atmosphere at about .93%. Argon is frequently used when an inert atmosphere is needed. It is used to fill incandescent and fluorescent light bulbs to prevent oxygen from corroding the hot filament. Argon is also used to form inert atmospheres for arc welding, growing semiconductor crystals and processes that require shielding from other atmospheric gases. Once thought to be completely inert, argon is known to form at least one compound. The synthesis of argon fluorohydride (HArF) was [| reported] by Leonid Khriachtchev, Mika Pettersson, Nino Runeberg, Jan Lundell and Markku Räsänen in August of 2000. Stable only at very low temperatures, argon fluorohydride begins to decompose once it warms above -246°C (-411°F). Because of this limitation, argon fluorohydride has no uses outside of basic scientific research.

Liquified Argon can be used to kill cancer cells in a specific treatment known as cyrosurgery. Blue argon lasers are used in surgery to weld arteries, destroy tumors, and to correct eye defects. It has also been used experimentally to replace nitrogen in the breathing or decompression mix, to speed the elimination of dissolved nitrogen from the blood
 * Medical significance**

Argon has 18 electrons/protons. Argon has 22 netrons. Argon is a colorless nobal gas.


 * Element Classification:** Inert Gas
 * Density (g/cc):**1.40 (@ -186Ã‚Â°C)
 * Melting Point (K):**83.8
 * Boiling Point (K):**87.3
 * Appearance:**colorless, tasteless, odorless noble gas
 * Atomic Radius (pm):**2-
 * Atomic Volume (cc/mol):**24.2
 * Covalent Radius (pm):**98
 * Specific Heat (@20°C J/g mol):**0.138
 * Evaporation Heat (kJ/mol):**6.52
 * Debye Temperature (K):**85.00
 * Pauling Negativity Number:**0.0
 * First Ionizing Energy (kJ/mol):**1519.6
 * Lattice Structure:**Face-Centered Cubic
 * Lattice Constant (Å):** 5.260