I've got one of those "research in other resources" questions in my chemistry homework. (meaning the info isn't in the lecture or the text, I guess :grumpy: ). It goes like this: Consider Group 1A and Group 1B of the periodic table. The text states that although A groups have very regular patterns, the "situation gets a bit more complicated with the B families". Researching in other resources, find out which of these predictions becomes more complicated. a) predicted number of electrons for each element in each group. b) predicted number of outer electrons for each element of each group. c) predicted formula when each element combines chemically with chlorine. I am not really sure what they mean by "prediction". For part a) if it's a neutral atom, can't I just tell how many electrons by the number of protons in the atomic number? For b) I am getting confused about outer electrons. The notes from my lecture sat that the group number tells you how many outer electrons there are. With Group 1A, it is always 1, and those were pretty easy to count(like with Lithium, 2 at the first energy level and then 1 at the second (and outer) level for a total of 3 given by the Atomic number), but how many outer electrons do copper, gold and silver have? I am not sure about this. For part c) I don't even know what they are asking. Any help is appreciated. Thanks!