I have the newest version and noticed some errors on #201 and 203.

#201 says that .20*60 is 1.2, when it is clearly 12. I got this one but I am not sure if #203 is wrong or not...

On #203, for choice e) it compares Sr++ with S-- and says that Sr++ is smaller in size than S--.... when Sr++ contains one more n principal quantum number than S--...

Comparing Sr++ with Se-- sounds right to me... Can someone clarify on #203 if the solution is right or not?

I have the newest version and noticed some errors on #201 and 203.

#201 says that .20*60 is 1.2, when it is clearly 12. I got this one but I am not sure if #203 is wrong or not...

On #203, for choice e) it compares Sr++ with S-- and says that Sr++ is smaller in size than S--.... when Sr++ contains one more n principal quantum number than S--...

Comparing Sr++ with Se-- sounds right to me... Can someone clarify on #203 if the solution is right or not?

I have an older version of destroyer, so I can't look it up...but I think for #203, Sr^+2 would be smaller than Sr^-2 because it has less electrons and they are pulled tighter by the core charge from the nucleus. Of course, I could be wrong...but this is how I think of these type of questions.

For example, Na+ vs. Na...the Na is larger because the core charge remains the same and thus the valence electrons from Na+ are pulled closer. In the case of Na+, you actually loose an entire shell..so to me it's very obvious that this would be smaller.

I have an older version of destroyer, so I can't look it up...but I think for #203, Sr^+2 would be smaller than Sr^-2 because it has less electrons and they are pulled tighter by the core charge from the nucleus. Of course, I could be wrong...but this is how I think of these type of questions.

For example, Na+ vs. Na...the Na is larger because the core charge remains the same and thus the valence electrons from Na+ are pulled closer. In the case of Na+, you actually loose an entire shell..so to me it's very obvious that this would be smaller.

He wasn't comparing Sr with Sr, but Sr++ and S--...

I don't understand that b/c it's got a whole shell even when you take away those two electrons.

I don't understand that b/c it's got a whole shell even when you take away those two electrons.

Yeah.. I think he meant to compare Se++ and Sr--

Yeah.. I think he meant to compare Se++ and Sr--

You starting off with Gen chem too? I just started studying a week few days ago and started on Gen chem.. I'm really surprised with the amount of information I flat out do not know. Pretty frightening because I have a 4.0 in the sciences lol. This stuff is starting to come back to me...sort of. lol