Step 5, just join all these parts together. Here we get chromium (II) because of the 2+ charge. Step 4, Put a Roman numeral in parentheses after the name of the metal to specify the oxidation state of the metal. Hey, notice that the prefix 'bis" is not in parentheses! The most common mistake is to put these prefixes into parentheses! I know this sounds wierd, but we have no choice but to do this because the ligand en (ethylenediamine) already contains the prefix "di" in it, using same set of prefixes will cause of confusion, and that is why scientists uses a different set of prefixes here. Step 3, specify the number and name of the ligands using prefixes such as 2 - bis, 3- tris, 4- terakis and so on. Use prefixes we learnt long long time ago for naming the other organic molecuels such as 2 - di, 3- tri, 4- tetra, 5- penta, 6 - hexa, so on so forth. Step 2 is, specify the number and name of the Cl- ligands. So since the whole coordination complex has a net charge of zero, Cr should have a 2+ charge. 2 Cl gives you 2- charge ( each Cl- gives you 1- charge). "en" means ethylenediammine, which has no charge. In this question, we can find the charge first. Let's use CrCl 2(en) 2 as an example first. After reading this, I believe you wll never make these mistakes agian. So below are the most common mistakes people can make when naming coordination complex. There are rules for naming coordination complex, but people usually makes some mistakes even the rules are in front of them.
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