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Eric Scerri, UCLA
Eric Scerri, UCLA's picture
Last seen: 10 months 5 days ago
Joined: 06/25/2009 - 9:49pm

The group 3 question. Which elements make up group 3?

This link is for an article on the group 3 question that has been debated for sometime.




I would welcome feedback and suggestions as the working group will soon be making recommendations to IUPAC on this issue.



eric scerri



The enclosed article is due to appear soon in From Mendeleev to Oganesson, Oxford University Press, edited by E. Scerri and G. Restrepo.  








Tylor Keller, Alfa Chemistry
Tylor Keller, Alfa Chemistry's picture
Last seen: 10 months 6 days ago
Joined: 04/24/2017 - 4:01am

Alfa Chemistry offers an extensive catalog of building blocks, reagents, catalysts, reference materials, and research chemicals in a wide range of applications, such as aucl3. Gold(III) chloride, traditionally called auric chloride, is a chemical compound of gold and chlorine. With the molecular formula Au2Cl6, the name gold trichloride is a simplification, referring to the empirical formula, AuCl3. The Roman numerals in the name indicate that the gold has an oxidation state of +3, which is common for gold compounds. There is also another related chloride of gold, gold(I) chloride (AuCl). Chloroauric acid, HAuCl4, the product formed when gold dissolves in aqua regia, is sometimes referred to as "gold chloride" or "acid gold trichloride". Gold(III) chloride is very hygroscopic and highly soluble in water as well as ethanol. It decomposes above 160 °C or in light.

Chip Nataro, Lafayette College
Last seen: 3 days 5 hours ago
Joined: 04/14/2008 - 9:10am

This is a really great question Eric. Electron configurations are always such a mess. I never get why gen chem books have to show the Cr and Cu anomalies, but that is a topic from another forum you started (https://www.ionicviper.org/forum/anomalous-configurations-such-cr-and-cu). I'll admit, I haven't given this a ton of thought, but I think I like Lutetium as the first 6d metal. The reason for me is that Hafnium is then filling the same orbitals that Lutetium is, the 6d. If you put Lanthanum in group the next element, Cerium, starts filling a completely different orbital, the 4f. Unfortunately, this logic kind of goes out the window with Lawrencium. O well, it isn't perfect. If anyone else has similar thoughts (or conflicting ones) I would sure love to hear them. I think it would be easy to change my mind. In fact, I hope you do because my mnemonic for memorizing group 3 is Sc(ott) Y(ou're) La(te) Ac(k) and I would hate to have to change it.