This is the 942nd most frequent German word.
israelischen
"Israelischen" means "Israeli" (adjective; relating to Israel).
The word 'israelischen' is used as an adjective modifying the noun 'Museum', and takes the ending appropriate for the accusative singular neuter form in this context.
Wir besuchten das israelischen Museum in Jerusalem.
We visited the Israeli museum in Jerusalem.
Here, 'israelischen' is an adjective describing 'Wissenschaftler', adhering to the plural definite article ending in the nominative case.
Die israelischen Wissenschaftler machten eine bedeutende Entdeckung.
The Israeli scientists made a significant discovery.
In this sentence, 'israelischen' modifies the noun 'Zeitung' and matches the accusative feminine singular expression with the accompanying indefinite article 'eine'.