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. All these guys are found on the left side. That means they will form basic Hydrides. And in fact, all metal Hydrides are either basic or neutral Hydrides.