And that's exactly why noble gases are very stable. They have very stable electron configurations. And in fact, any atom that is not a noble gas will try to attain. So it will try to either lose or gain electrons such that its electron configuration matches that of one of the noble gases. And this is what we call the octave rule. So the octave rule is simply the process of filling electron shells or electron orbitals in a way such that an electron configuration that matches one of the noble gases is reached.