Problem

Predict the charge on the monatomic ions formed f…

05:40

Problem 4 Easy Difficulty

Which of the following atoms would be expected to form negative ions in binary ionic compounds and which would be expected to form positive ions: Br, Ca, Na, N, F, Al, Sn, S, Cd?

Answer

Among these elements, Ca, Na, Al, Sn, and Cd can form cations as they are metals while
Br, N, F, and S form anions as they are non-metals. The formal charge on the cations,
anions, and examples of binary compounds that can be formed is given in the following table:
see table

Allea C.

University of Maryland - University College

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Video Transcript

So we're being asked whether these elements are going to form negative ions in a binary ionic compound or positive ions. So whether we're making a an an ion which is negative or cat eye on which is positive. What we have to remember when we're doing these is that our medals will form a cat eye on which is our positive ion. Our non metals will form an ions and that again is our negative ion. So you really just need to be familiar with your periodic table. Right? Look something like this. We have our lengthened IEDs and actinides that are normally pulled out down at the bottom. If we ignore this spot that I'm going to color in red, that's hydrogen. Everything else that is above our metal Lloyd line and our metal Lloyd line runs down here. It's going to be not exactly, that's fine. Everything underneath this metal Lloyd line or to the left of this metal Lloyd line. These are all metals. So everything over here, including the stuff down here, our medals, everything in red including that little hydrogen over there. We are going to consider a non metal for ionic bonding. So when we go to do this, the first element they give us is booming Roaming is in group seven a. Or column # 17. That's way over in this area. Okay so bro mean is in the red area that is going to be a nonmetal, which means this is going to form a negative ion, calcium is in group two A Group two A. is over here. Okay X marks the spot that group to a If you know the group names, it's the alkaline, earth metals. It's a metal. Therefore it is going to be a cat eye on which means positive ion sodium N. A. That's in group one a. It's over here maybe down a little bit. But it's over in that first group because it's over in that first group, it is going to give us a positive ion. Next up we have nitrogen, Nitrogen is in group five a. That is this side of our periodic table. So this is going to be negative because it's a non metal Florina is in group seven a. That's the group right next to our noble gases that column there. So florian is also going to form a negative ion aluminium. You probably have to look this one up. It is actually right here, that large black dot that I just drew. It is a metal. Okay, it is in group three a. It will form a positive ion. Next up is 10. So, if this is Group three A Group 10 is in Group four A. It is down in this area. Okay. Which makes that a metal and metals are going to form positive ions. Just going to give myself a little more space. Well, right out tin over here, that one is going to be positive. We have two more sulfur, Sulfur is in the same group as oxygen group six a. It's right about here. Um that is going to be a negative ion because it's in the red area, and the last one we have is cadmium, cadmium is somewhere in here. It is a transition metal, and so cadmium is going to give us a positive ion. Hopefully that helps.

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