Welcome!!! Again--remember that this is a completely public site........... On my screen I am purple.... Mr. Howe THIS IS WHAT YOU NEED TO STUDY TONIGHT: These three quizez in order.~Julian http://www.sciencegeek.net/Chemistry/taters/Unit2PeriodicTrends.htm http://ths.sps.lane.edu/chemweb/unit8/problems/ptrend/ http://www.quia.com/quiz/1041890.html?AP_rand=1121229392 AND spend time answering the questions on quiz one and two. If you need some help refer to the tables on the FB page, but defiantly try a couple times without. Because we need to know this stuff. hi~ i have a question about finding similar electron configurations...if there is more than one element that fits, how do you find the right one? I think I need context for this one. There will only be one element that fits. Do you have an example? Why did you ask this question? Okay. Here are the trends we've been going over: Atomic Radii: Size of atom i.e the amount of electrons associated Ionization potential: The amount of energy required to remove electrons yes. Technically this is the energy change when an electron is removed, but the values are always positive, so we are talking about energy required. Electronegativity: attractivness of atom to electron to a shared pair of electrons in a chemical bond. Electron affinity: energy change when an electron is added. Usually negative -- except for the noble gases and the alkaline earth metals. Negative values are desirable, because of the the universal trend toward lower energy. so....the bigger the negative value, the more the atom desires to gain electrons. Ashley, you need to spend time on the quizzes listed on the web site. There are two that include answers with explanations. ok how do i get to those?? howechem.net, advanced chemistry, periodicity, practice quizzes. LISTED UNDER HW FOR 10/18......I DON'T SEE PERIODICITY ETC... yes! So.....do nonmetals react by losing electrons or by gaining electrons?...losing? The general rule is that if there are 4 or less electrons in the valence shell, the atom will lose electrons. 5 or more menas the atom will tend to gain electrons....... Br has 5 7 7 valence e- so.... they gain yes. So would big atoms or small atoms gain electrons easier? bigger atoms bigger atoms have more shielding,(inside layers of electrons) so they will lose electrons easier. However, they will have a harder time gaining electrons. So---which gains electrons easier----Br or I? Br because it's smaller. yES..... so that means that Bromine will be more active than iodine, since it is able to more easily gain electrons. k. i'm going to go write this down in my notes, thank you The most active metal is Fr, because it is the biggest. The most active nonmetal is F, because it is the smallest (that has openings in the outer shell--He is smaller, but full) Due to lack of intense questioning I am going to take another break.... I will check back at appx. 9:40 for the last time tonight... I'm Back.... Last call for questions......... Good night everyone. Are people still here?