Half the size of regular Snatoms, this is the pro version, containing all the atoms of the expansion kit: 12 carbon, 12 oxygen, 26 hydrogen, 4 nitrogen, 2 sulfur, 2 phosphorus, and 4 chlorine atoms, plus 6 double bonds or 4 triple bonds. This kit is not for kids (because the parts are small and a choking hazard).

Snatoms are a molecular modeling kit where the atoms snap together magnetically. 

1. They...