now positive amines are acidic. So let's think of some examples here we could have NH four br We could have ch three NH three cl. We could have C six h five NH three n 02 All different examples on what you should realize here is you just have to think of it like this. You could say that this first compound could be in a mean, but what's messing it up? That bro Ming is messing it up. That one element there signifies that we have assault, so you should know to break it up into its ions. So this breaks up into NH four. Positive. This breaks up into B are negative. We have a positive, I mean so therefore that, I mean, is automatically acidic. So remember, just tell yourself it could be in a mean. It could fit either this description or this description, but there's something that's interfering with it. What's that one thing? It's usually going to be at the end, and it's going to be a negative, an ion. So just break it up into its two ions. You'll have your positive of me and you'll have your negative ion. You're an eye on Look at the positive mean it's automatically going to be acidic. This to this could be a mean, but what's messing it up? The chlorine at the end? So it's assault. So break it up. We know it has to be plus one, because the halogen Zara Group seven A and there minus one. And look, we just isolated another positive. I mean, therefore, it's a cynic, just like this one is acidic. Finally, the last one, we could say that this portion here could be our mean, but what's messing it up? N O. To remember N 02 is our nitrite ion all those probably atomic on and you guys have to learn earlier on. You still have to remember them. So here, that's going to be C six h five NH three plus one. This is going to be N O to minus one again, let's not worry about the negative ions just yet. What's important for right now is that we have a positive I mean isolated, so it's going to be acidic. So remember, if we have transition metal, it needs to be plus two or higher to be acidic. If it's not. It's neutral for men, group medals, medals and groups. One a two a three a and four A. They have to be plus three or higher, or they're going to be neutral. And for the main group medals, if you really think about it, since the main group metals have to be plus through your or higher, that automatically means that group one A, which are always plus one and group to a, which are always plus two, will always be neutral. So they're not gonna meet the requirement. So if you see a assault question on your examine that has a group one A or to a metal involved automatically, that metal's going to be neutral because it's not gonna meet the minimum requirements. Group three X Plus three. So if you see aluminum or gallium or something, those will be acidic. It gets a little tricky and group for a. If you have a periodic table near you, just take a look at it in Group four A. We have 10 s n, and then we have led. Now they're in Group four A. But remember I said this several videos ago that these two, even though their main group, metals. They can act like transition metals that could be either plus two or plus four. So be careful. Which one are they giving you? If they're giving us M Plus two or P B Plus two, their main group metals, they don't meet the minimum requirement of plus three, so they would be neutral. But if you have sm plus four or P B plus four, then they wouldn't meet the minimum requirements and they would be acidic. So that was a little tricky. So remember that.