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. Argon is the third most...

Argon (18Ar) has 26 known isotopes, from 29Ar to 54Ar, of which three are stable (36Ar, 38Ar, and 40Ar). On the Earth, 40Ar makes up 99.6% of natural...

Potassium–argon dating, abbreviated K–Ar dating, is a radiometric dating method used in geochronology and archaeology. It is based on measurement of the...

Sulfur-35 Sulfur-38 Chlorine-34m Chlorine-36 Chlorine-38 Chlorine-39 Argon-39 Argon-42 Calcium-41 Iron-60 Nickel-59 Selenium-79 Krypton-81 Strontium-90...

giving terrestrial argon a standard atomic weight of 39.948(1). However, such is not the case in the rest of the universe. Argon produced directly, by...

matter Experiment using Argon Pulse-shape discrimination) is a direct dark matter search experiment which uses liquid argon as a target material. DEAP...

a neutrino. Potassium-40 is especially important in potassium–argon (K–Ar) dating. Argon is a gas that does not ordinarily combine with other elements...

16 polonium-209 125.2 3.95 americium-242m1 141 4.4 silicon-32 170 5.4 argon-39 269 8.5 berkelium-248 >300 >9.5 californium-249 351 11.1 silver-108m 418...

coolant was exposed to neutron radiation, it contains some radioactive argon-39, with a half-life of 269 years. There is no risk of surface contamination...

of rubidium to strontium, samarium to neodymium, uranium to lead, argon-40 to argon-39, or rhenium to osmium. Those found in kimberlites have ages ranging...