Az Univerzumban több a neon, mint az argon, a Föld légkörében viszont több, mint 500-szor annyi argonatom van, mint neonatom. Hogy lehet ez?

ami kisebb, az könnyebben is szökik.

Úgy, hogy az Ar a 40K bomlásából képződik a Földön.

wikipediabol: "Neon is actually abundant on a universal scale; it is the fifth most abundant chemical element in the universe by mass, after hydrogen, helium, oxygen, and carbon (see chemical element). Its relative rarity on Earth, like that of helium, is due to its relative lightness, high vapor pressure at very low temperatures, and chemical inertness, all properties which tend to keep it from being trapped in the condensing gas and dust clouds which resulted in the formation of smaller and warmer solid planets like Earth."