So let's look at argon. Argon has 18 protons found in the nucleus, 18 electrons found in the surrounding orbital. So we're going to have two electrons in the one s orbital, two electrons in the two s orbital, six electrons in the three p orbitals. So a total of six in the p.
Now we're going to have two electrons in the three s orbital, and three p will have six electrons. So, once again, every orbital within our gun is completely filled, just like it was in neon and helium. And in fact, these three atoms are noble gases.