![]() ![]() So you see hydrogen there is right above lithium. So the first thing I'm going to do to make the periodic table more the way I personally like it is move hydrogen. Sometimes it does loose an electron, like in alkaline metals, but other times it doesn't. I don't actually think that's the best place for hydrogen. This periodic table has drawn hydrogen above the alkaline metals. What do I mean by an atom becoming isoelectronic with a noble gas? Well let's take a look at the periodic table and see. Another driving force that you may have heard about is that atoms of the main group elements want to become isoelectronic with the noble gases. So the electrons can go to lower energy by leaving metals and joining nonmetals. ![]() Are that, the system wants to lower its energy. The driving force, once again, for these processes. They tend to gain electrons, often by taking those electrons away from metals, and the nonmetals tend to form anions. Which means they have large electronegativity. Nonmetals on the other hand, have relatively low energy open orbitals. They tend to lose electrons and become cations because of this. One of the things you might remember is that the metals have relatively small ionization energy. Look at a periodic table now, to remind yourself of a couple of periodic trends that have been discussed in this course. ![]() Finally, we'll wrap up by talking about some of the common polyatomic ions. In this lecture I'll review the driving forces for ion formation, and show how this was translated into a set of rules for assigning oxidation states to atoms in all kinds of compounds. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |