interpersonal chemistry is a noun meaning "the way two individuals relate to each other". It carries one recorded sense.
the way two individuals relate to each other
“their chemistry was wrong from the beginning -- they hated each other”
“a mysterious alchemy brought them together”
Definitions, synonyms and semantic relations for interpersonal chemistry come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.