Now, if we take a look here, we're gonna say when it comes to bases, there are three features that were supposed to look out for. Generally, bases possess medals. So from metal is involved, then it's most likely going to be a base. We're going to see a couple exceptions of that when we get to ANFO Terek species. But for right now, let's not worry about that. Next, we're gonna stay basis, tend to have a negative charge. Okay, so bases will have medals or a negative charge, or they'll be classified as another compound, which we call a means now means are or organic type of compound. But we get to see them for the first time in chemistry. So before you guys move onto organic, you get a small taste of what a means are. And how exactly do they relate to bases? So if we take a look at the rules, we're gonna say Group one A. We're gonna say any group won a medal when they combined with any one of these four ions make a strong base. Now, these four ions, we call them hydroxide ion hydrogen can be positive or negative when it's positive it's called Hydro Nia My on. But when it's negative, it's called hydride ion. 02 minuses oxide and NH two minus is a mydd. So notice all of them and with i d e. Because they have a negative charge present. So if one of these negative ion combines with any group won a medal, it's gonna create a strong base. Now recall what are the charges of Group one? A medals group 18 medals are plus one. So, examples we could have any positive ally Positive C s positive K positive. Any of these ions could react with any one of those four ions to give me a strong base. So a year and a positive O H minus combined together to give me an H. This would give me Al I h The two from here would come here. The one from here would come over here CS then here we have K and h two. Remember, you can mix and match any group. When a ion with any one of those four here we get sodium hydroxide, lithium hydride, caesium oxide, potassium hmeid. So, again, any group win a medal with one of those four ions will create a strong base, and strong bases don't require a nice chart in order to find pH or P O. H.