21Ne22Ne

21Ne22Ne refers to a specific isotopic composition of neon. Neon is a chemical element with the symbol Ne and atomic number 10. Naturally occurring neon is a mixture of three stable isotopes: 20Ne, 21Ne, and 22Ne. The notation 21Ne22Ne indicates a sample or scenario where the isotopes Neon-21 and Neon-22 are of particular interest or are being considered together, potentially in a ratio or as a focus of study.

Neon-21 (21Ne) is a stable isotope that can be produced through various nuclear reactions. It is known to be formed in the decay of fluorine-21 and through neutron capture by neon-20. Neon-22 (22Ne) is the most abundant stable isotope of neon, making up approximately 8.8% of natural neon. It is also a stable isotope with no known radioactive decay.

The relative abundance of these isotopes can vary slightly depending on their origin, such as in geological samples or in materials exposed to cosmic rays. Scientists may study specific isotopic ratios like that of 21Ne to 22Ne for purposes such as geochronology (dating rocks) or to understand the history of solar system materials, as different isotopic signatures can reveal information about the processes they have undergone. In some research contexts, this notation might represent an artificially enriched sample or a theoretical mixture.