The noble gases include helium, neon, argon, xenon. What do their electron configurations have in common? Answer choices:
a- In the highest occupied energy level, the s sublevel is filled and the p sublevel is empty.
b- In the highest occupied energy level, the p sublevel is half-filled.
c- In the highest occupied energy level, the s and p sublevels are completely filled.
d- In the highest occupied energy level, the s sublevel has one electron.