The following table shows the atomic nuclei that are isotonic (same neutron number N = 22) and isobaric (same nucleon number A = 40) with Argon-40. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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. All other isotopes have half-lives of less …

Argon is the most abundant noble gas in Earth's crust, comprising 0.00015% of the crust. Nearly all argon in Earth's atmosphere is radiogenic argon-40, derived from the decay of potassium-40 in Earth's crust.

List, data and properties of all known isotopes of Argon. An argon isotope is an atom that has exactly Z = 18 protons in the nucleus; the individual nuclides differ in the number of neutrons (N) and thus in the total number of nucleons A (= mass number = Z + < i>N).

Detailed decay information for the isotope argon-40 including decay chains and daughter products.

(0) Argon. Stable. Argon-36. 36 18 Ar Argon Isotopic Enrichment (atom %): ... Product Form. Quantity. Liters Added. Add to Quote Argon-40. 40 18 Ar Argon Isotopic Enrichment (atom %): >99.95 Natural Abundance (atom %): 99.60 Product …

Argon is a noble gas. The noble gases are the six elements in Group 18 (VIIIA) of the periodic table. The periodic table is a chart that shows how the chemical elements are related to each other.

…of mass 40 (40 K) to argon gas of mass 40 (40 Ar) formed the basis of the first widely used isotopic dating method. Since radiogenic argon-40 was first detected in 1938 by the American geophysicist Lyman T. Aldrich and A.O. Nier, the method has evolved into one of …

Argon-40 is a stable isotope of the noble gas argon, consisting of 18 protons and 22 neutrons in its nucleus. It is significant in understanding radioactive decay processes because it is produced as a byproduct of the decay of potassium-40, which is a …

Isotope of Argon. Argon-$40$ is the isotope of argon which has $22$ neutrons in addition to its $18$ protons. Ar-$40$ is the most common stable isotope of argon, making up $99.6 \%$ of the argon found on Earth.