I've never really taken any chemistry before so I'm currently taking a class and the more I learn about it, the more interesting it becomes. However, I do have a few questions (you might find simple) that are kind of bugging me as we begin to progress through the chapters... 1. When trying to make electrons produce photons, does the color of the light emitted depend on what temperature you use or how you excite the atom? 2. If you have an electron in the, let's say, 1st energy level and it absorbs enough energy to get to the 5th energy level or anything above the 1st level, what happens to the first level? There's only 1 electron left there...or does the atom just become unstable for a bit? 3. Okay, about photoionization...what's up with it? What happens to the electron that was lost? If you were to isolate one single atom or there were no other atoms it could bond with, what would happen? 4. So I didn't quite grasp what the continuous spectrum was. I know the line spectrum...but what relations does the continuous spectrum have with it? 5. I'm not so sure on how the orbitals would look on an atom. Are electrons intercepting eachother's orbitals? Could you bring the nucleus of such a HUGE atom that it makes the electrons of another atom attract to it also? (so that maybe they crash?) 6. Alright, does the quantum mechanical model of an atom tell you where a particular electron you're looking for is or does it tell you where you're likely to find an electron? (Are electrons always in orbitals?) 7. So if an electron is in the let's say...Px orbital, will it always stay in the Px orbital or will another electron (from any orbital/energy level) come and take turns with it? If the electron in a specific orbital does change, does that mean any electron from any energy level can take its place? 8. Why does the electron emit an amount of energy that is the "difference between levels" instead of keeping it simple and emitting what it absorbed to reach those levels? Or is that what the difference is...? 9. Okay, so why would an atom be unstable if it doesn't have its valence shell completely filled? It has an amount of electrons equal to the amount of protons, so shouldn't it be stable...? I'm thinking this has to do with having too much energy burdened on an electron, so if that's it, why can't the electron just emit the energy out as photons? 10. About isotopes: Why would the number of neutrons affect the element and make it unstable if neutrons are neutrally charged? What does mass do other than make the atom heavier? Why would more mass make the atom unstable, in other words. 11. On Physical/Chemical changes: Would dissolving sodium chloride in water be physical or chemical? NaCl is a compound which has its bond broken apart in water--chlorine is separated from sodium (for crying out loud!) and they attach to H2O molecules. Then when you evaporate water, sodium and chlorine bond again...which I would think would be another chemical change? 12. Waves/Radars: If a radar detector is a receiver, how would a radar detector detector work? Wouldn't this mean the radar detector also emits some sort of radiation? That's all I've got for now. I apologize for bombarding you guys with so many questions (like a nuclear reaction!! :D), but I'd really like to know this and understand--hopefully--every bit of it. Thanks.