This ratio is changing over time (very slowly), as the nuclear reactions continue, converting smaller atoms into more massive ones. (enchantedlearning.com)
In addition to the possibility of using these cages for trapping small atoms and molecules and study them in confinement, the presence of Ar atoms within the cages affects the passage of small molecules through the 0.5 nm thick two - dimensional framework, allowing the reversible tuning of the permeability of the smallest molecular sieve ever reported. (nature.com)
Nuclear fusion joins small atoms like hydrogen, releasing huge amounts of energy in the process. (rochester.edu)