Now, if we look at our emeritus table, we see a trend. We see that as we go across the period from left to right, the acidity of Hydrides increases. And as we go down a group, the acidity of Hydride also increases. So that means atoms that exist on the left side of the period that form Hydrides are basic atoms that exist in the middle, that transition atoms or transition metals that form Hydrides with H form either mutual or basic Hydrides. And for the most part, atoms that I found on this part on the right side form either weak acids, strong acids, or neutral Hydrides. So for example, let's look at sodium and lithium and potassium.