That basically means that very small green values. So atoms on the left side of the periodic table will form bonds with atoms that have high electron affinities. So atoms that have very high brown numbers. So notice that fluorine, chlorine, oxygen and sulfur all have much higher values than brown values compared to this side, where we have zero point 62 for lithium, almost zero for both magnesium Beryllium and 00:55 for sodium. In other words, ionic bonds will only form between atoms found on the left side and atoms found on the right side of our periodic table. Now notice I didn't label anything for our noble gases.