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Argon is a chemical element; it has symbol Ar and atomic number 18. It is in group 18 of the periodic table and is a noble gas . [ 10 ] Argon is the third most abundant gas in Earth's atmosphere , at 0.934% (9340 ppmv ).
The properties of the seventh, unstable, element, Og, are uncertain. The intermolecular force between noble gas atoms is the very weak London dispersion force , so their boiling points are all cryogenic, below 165 K (−108 °C; −163 °F).
Physical properties. Solid. Physical property Helium Neon Argon Krypton Xenon Radon; ... Argon: 2.70–8.50 Neon: 60–120 Krypton: 400–500 Xenon: 4000–5000
Physical properties; Phase at ... Spectral lines of argon: Other properties; Natural occurrence: primordial: ... Theoretical element Applied: when element is ...
Boca Raton, Florida, 2003; Section 6, Fluid Properties; Critical Constants. Also agrees with Celsius values from Section 4: Properties of the Elements and Inorganic Compounds, Melting, Boiling, Triple, and Critical Point Temperatures of the Elements Estimated accuracy for Tc and Pc is indicated by the number of digits.
Argon: Potassium: Calcium: ... The table below is a summary of the key physical properties of the group 12 elements. ... Properties of the group 12 elements Name Zinc ...
Argon: Potassium: Calcium: Scandium ... The table below is a summary of the key physical properties of the group 5 elements. The question-marked value is predicted ...
Argon (18 Ar) has 26 known isotopes, from 29 Ar to 54 Ar, of which three are stable (36 Ar, 38 Ar, and 40 Ar). On Earth, 40 Ar makes up 99.6% of natural argon. The longest-lived radioactive isotopes are 39 Ar with a half-life of 268 years, 42 Ar with a half-life of 32.9 years, and 37 Ar with a half-life of 35.04 days.