Which element, under normal circumstances, does not combine chemically with other elements to form compounds?

That would be the NOBLE GASES (Helium, Neon, Argon, Krypton, Xenon, Radon).  Because these elements have a filled outer shell (thus giving them the full octet that other elements crave), they are stable elements under normal circumstances and as such resist chemical combination.

Plz note that under special conditions, noble gases such as Xenon and Radon can form compounds  (Xenon Fluoride and Oxide; Radon Fluoride) 

Woah that’s a lot to read xd i’ll try though. i’ll get back t you if. i know the andwer