Argon (pronounced /ˈɑrɡɒn/) is a chemical element designated by the symbol Ar. Argon has atomic number 18 and is the third element in group 18 of the periodic table (noble gases). Argon is present in the Earth's atmosphere at 0.93%. It is the third most abundant gas and the most frequently used of the noble gases. Argon's full outer shell makes it stable and resistant to bonding with other elements. Its triple point temperature of 83.8058 K is a ...
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Argon
Chemical Element
The 18th Element in the Periodic Table
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Chlorine
Chlorine (pronounced /ˈklɔəriːn/ KLOR-een, from the Greek word 'χλωρóς' (khlôros, meaning 'pale green'), is the chemical element with atomic number...
Symbol:
- Ar
Atomic mass:
| Mass | Uncertainty |
|---|---|
|
|
Electrons per shell:
- 2,8,8
Atomic radius:
- 71 pm (0.0000028 )
Covalent radius:
- 0.97 pm (3.8E-8 )
Van der Waals radius:
- 188 pm (0.0000074 )
Isotopes:
View entire collection »Melting Point:
- -189.2 °C (-308.6 °F )
Boiling Point:
- -185.7 °C (-302.3 °F )
Periodic table block:
Ionization Energy:
- 15.7596 eV (0.0000157596 MeV )
Discovery Date:
- 1894
Discovering Country:
Electron Configuration:
- Ne 3s2 3p6
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Nitrogen
Nitrogen (pronounced /ˈnaɪtrɵdʒɨn/ NYE-tro-jin) is a chemical element that has the symbol N and atomic number 7 and atomic mass 14.00674 u. Elemental nitrogen is a colorless, odorless, tasteless and mostly inert diatomic gas at standard conditions, constituting 78% by volume of Earth's atmosphere.... -
Hydrogen
Hydrogen (pronounced /ˈhaɪdrɵdʒɨn/, HYE-dro-jin) is the chemical element with atomic number 1. It is represented by the symbol H. At standard temperature and pressure, hydrogen is a colorless, odorless, nonmetallic, tasteless, highly flammable diatomic gas with the molecular formula H2. With an... -
Radon
Radon (pronounced /ˈreɪdɒn/, RAY-don) is a chemical element with symbol Rn and atomic number 86. It is a radioactive, colorless, odorless, tasteless noble gas, occurring naturally as the decay product of radium. It is one of the heaviest substances that remains a gas under normal conditions and is... -
Krypton
Krypton (pronounced /ˈkrɪptɒn/, KRIP-ton; from Greek: kryptos "hidden") is a chemical element with the symbol Kr and atomic number 36. It is a member of Group 18 and Period 4 elements. A colorless, odorless, tasteless noble gas, krypton occurs in trace amounts in the atmosphere, is isolated by... -
Xenon
Xenon (pronounced /ˈzɛnɒn/ ZEN-on or /ˈziːnɒn/ ZEE-non) is a chemical element represented by the symbol Xe. Its atomic number is 54. A colorless, heavy, odorless noble gas, xenon occurs in the Earth's atmosphere in trace amounts. Although generally unreactive, xenon can undergo a few chemical... -
Selenium
Selenium (pronounced /sɨˈliːniəm/ sə-LEE-nee-əm) is a chemical element with the atomic number 34, represented by the chemical symbol Se, an atomic mass of 78.96. It is a nonmetal, chemically related to sulfur and tellurium, and rarely occurs in its elemental state in nature. Isolated selenium...