Which sublevels are full when an atom has a noble gas configuration?

s-sub-level and p-sub-level

Explanation: Group 18 elements in the periodic table are known as noble gases. They have an octet configuration with their outermost s and p-sub-levels full, which makes them inert or nonreactive. The s-sub-level takes up a maximum of 2 electrons while the p-sub-level holds a maximum of 6 electrons. They include, argon, neon, xenon, krypton, etc. Their electron configuration shows full outermost s and p-sub-levels. For example; the electron configuration of Ne is 1s²2s²2p⁶, with full s and p sub-levels.