This is the 18381st most frequent Russian word.
экспонатов
"Exhibits" or "items on display."
In this sentence, 'экспонатов' is used in the genitive plural form to indicate possession or quantity of exhibits in the museum.
В музее представлено много уникальных экспонатов.
The museum showcases many unique exhibits.
Here, 'экспонатах' is in the prepositional case plural form, used to denote location or context involving the exhibits.
Во время экскурсии нам рассказали о нескольких интересных экспонатах.
During the tour, we were told about several interesting exhibits.
In this case, 'экспонаты' is in the nominative plural form, used as the subject of the sentence referring to the exhibits.