If you remember  we did line spectrum of H atom in chapter 7.
When electron jumps from high energy to low energy there is release of energy,
Different energy transitions feasible  are
3s....>2p
2p....>2s
3s....>2s
2p....>1s
3s....>1s
2s....>1s

Your thinking is perfect and P is the central atom here Remember first rule ,least EN atom must be the central atom.Here P is least EN and yes it can hold 5 bonds and 10 electrons because it can have expanded octet.
Moreover P is one atom and Cl are five ..that also indicated that  P is the central  atom.

Hi! I had a question while making the Lewis dot structures for PCL5; I thought that cl might be the central atom, but then I also felt that , couldn't phosphorous be the central atom because even though chlorine is more electron negative, can't phosphorous form more bonds, because can't it fit in more valence electrons, because of the empty d orbitals it can utilize? Is my thinking correct? I'm not sure about this one, so I left it blank.

I know this chapter quiz is like a test, but I'm confused about what they are asking in this question, I like don't get it.

Wait, so to clarify,  Fe3+ has the smallest radius size; so it's the most electron-negative?

I am confused about this question; viscosity is the resistance to flow, right? Then, which molecule would it be because #1 = is Dibromomethane, which I searched up, and it said it's very dense and denser than water, so it would have low viscosity. Then #2, I don't know. , I searched it up and it said Ethylene Glycol, then #3 is Phelethanol, I think, and #4, methyl chloride, which is a refrigerant I'm pretty sure, and #5,dimel ether  I also didn't know about this one.

I was generally confused because I thought all of these have low viscosities, but when I submitted the quiz it said #2, Ethylene Glycol has the highest viscosity,  could you explain why it's Ethylene Glycol? Does this have to do with the IMF (inter-molecular forces of attraction)? Sorry if this doesn't make sense.

Hi, I was wondering what symbol is in the question?

thank you!

You can post questions and doubts here and you can take advantage of 15 minutes before the next class for doubts and questions.

Hi Uma Mam, i have my chem test next Tuesday (feb 25) and I was wondering if we could go over practice questions that might show up on my exam for unit 6 (thermochemistry) during class this Saturday (and Sunday if necessary). This would be really beneficial so please do let me know. Thank you.