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Chemistry / How does Barium Hydroxide form?

« on: 21/05/2016 05:37:11 »

I'm trying to do this through the Lewis dot structure, but if barium needs to lose two electrons and hydroxide has hydrogen with already 2 electrons and oxygen with all 8 electrons, how do thesecombine? Do you separate the oxygen and hydrogen and leave the oxygen with the 8 electrons and then give one of barium's electrons to the hydrogen and then repeat the process? I know it looks like Ba(OH)2, but when I try to do this through the lewis dot structure I don't see how this happens.

2

Chemistry / What are "Energy Levels" in atoms?

« on: 20/05/2016 07:06:11 »

I read this: "For example, the first energy level has one sublevel and the second has two and so on, in general, the nth energy level has n sublevels." But I thought there are only the four sublevels, which are spdf. So how can the 7th energy level have 7 sublevels when there are only the four sublevels?

Edit: Okay, so I looked it up and there are apparently 7 energy levels. Nevermind.