This pair of molecules are . Two ball-and-stick models of molecules. The first molecule consists of five black balls, which form a cyclical structure. Each black ball has two white balls attached. The second molecule has a chain of five black balls connected successively. Each of the two black balls, which are at the ends of the chain, has three white balls attached. Each of the three other black balls has two white balls attached. identical not isomers enantiomers structural isomers cis-trans isomers (geometric isomers)