a. $+2, mathrmmercury(II) sulfide$.b. $+2, mathrmcopper(II) carbonate$.c. $+2, mathrmnickel(II) chloride$d. $+3, mathrmcobalt(III) nitrate$.e. $+2, mathrmcopper(II) hydroxide$f. $+2, mathrmiron(II) sulfate$.




You are watching: How to find the charge of a transition metal

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Write the cation an anion in each compound, then determine the correct chemical formula. Copper (II) sulfide Nickel (II) nitride Iron (II) carbonate Cobalt (II) sulfate Iron (III) carbonate Chromium (VI) oxide


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Video Transcript

question Number 62 is in reference to the naming of ionic compounds that contain a transition metal because transition metals can have variable positive charges when forming ionic compounds. The first thing that we have to do when naming these compounds is identify what the charge on the anti on is that typically has a constant charge. After we've identified the charge on the anti on. Then we identify the charge on the cat ion such that the Ionic compound is neutral with a total neutral charge. So, for example, if we have hte G s, we look at the periodic table we see that s sulfur is in group six, a group six A. Corresponds to elements non metals that typically want to take on two additional electrons and have a to minus charge. Therefore, Mercury H G needs to have a two plus charge. So we have a neutral compound. We would then name this mercury to sulfide. The next one is C. U C 03 Cocoa three is not found on the periodic table, but it is a poly atomic ion, which is very common that you should have memorized with a to minus charge because it has a to minus charge than the copper needs to have a two plus charge. So we have a neutral ionic compound. This would then be copper to carbonate. The next one is N I C L two c. L is in group seven A. It typically wants to take on one additional electron to become like its nearest noble gas. So each halogen in Group seven A typically has a one minus charge in an ionic compound. There are two of them, so that's a total of a to minus. So the nickel then must have a two plus charge. This would be nickel to chloride. Then we have C U N 03 three Uh oh, No. Three is a poly atomic ion that you should have memorized with a one minus charge. There are three of them, so that's a total of three minus. So the cobalt needs to have a three plus charge. This would be cobalt three nitrate, then for E. We have 20 h groups and O H group. You should have memorized as a poly atomic ion with a one minus charge. This is hydroxide because we have two of them. That's a total of two minus. So each copper needs to have a two plus charge. This would be copper too hydroxide. And for the last one, we have iron with eso four. Eso four is a poly atomic ion that you should have memorized that has a to minus charge. We just have one s 04 So each iron needs to have a two plus charge. To get a neutral compound, this would be named iron to sulfate.