This is the 11512th most frequent Polish word.
jądrowe
"Jądrowe" means "nuclear" in English.
The word 'jądrowe' is used here as an adjective meaning 'nuclear', describing a type of chemical reactions related to the nucleus of an atom.
Omawialiśmy jądrowe reakcje chemiczne.
We were discussing nuclear chemical reactions.
In this sentence, 'jądrowe' describes 'properties', referring to characteristics associated with nuclear physics or phenomena.
W laboratorium badano jądrowe właściwości materiałów.
In the laboratory, the nuclear properties of materials were being studied.
Here, 'jądrowa' as an adjective modifies 'energia' to signify 'nuclear energy', indicating the generation of energy via nuclear processes.