Final answer:
The element that completes the 3p sublevel is the Noble Gas, Neon (Ne).
Step-by-step explanation:
The element that completes the 3p sublevel is the Noble Gas, Neon (Ne). According to the periodic table, the 3p sublevel is filled with the next six elements after the 2p sublevel, which include Boron (B) through Neon (Ne). Neon (Ne) is the last element in the 3p sublevel.