In other words, because we have nine protons in our nucleus and seven electrons on our outer shell, our force with which our nucleus pulls those electrons is much greater than the force with which these three protons are pulling a single electron. And so that means if we place some arbitrary electron equidistant between these two atoms what? We see that this fluorine will pull this electron with much more force than this guy. And that means as we go from lithium to beryllium, to boron, to a carbon to nitrogen to oxygen, finally, to fluorine our electronegativity increases, and in fact, fluorine is the most electronegative atom and electronegativity is actually measured on a scale called the polling scale, and it's given a highest value of 4.0. Now, as we go across the period from left to right, we see that our electronegativity increases how about as we go from top to bottom? Well, as we go from top to bottom, our atomic radius increases.