Exceptions

[Norah Gidanian 3D]

Do we just need to memorize which atoms are exceptions or is there a way to tell? Also what are all of the exceptions we should have memorized.

[Kayla Booker 1F]

I’m not sure about how many exceptions there are, the ones I know of are B, Al, and Be. The way to tell that they are exceptions is if there is no way for the middle atom to create and octet

[Charlotte Adams 1A]

The books says there are several types of exceptions:
- a molecule might have an odd number of electrons so octet formations is numerically impossible (radicals)
- atoms of certain elements might be able to accommodate more than eight electrons in their valence shell (expanded valence shell)
-an atom might form compounds with incomplete octets (incomplete octet)

hope this helps!

[Chelsea_Guzman_3C]

I think being able to recognize or understand what makes an atom an exception is best. But knowing some like Be and B could be just as helpful, but I doubt memorizing all of them is necessary.

[605291562]

I think being able to recognize them is more important then memorizing them, based on how this class has worked so far I feel like it has been more about application than memorization. Also I think if it was something to memorize it would have been listed on the outline.

[IshanModiDis2L]

I would agree with what was said above, the way to tell that they are exceptions is that if there is no way for the middle atom to achieve a full octet. You do not need to memorize all of them, I would say its more favorable if you recognize them instead.

[Heather Szeszulski 1I]

I think being able to recognize or understand what makes an atom an exception is best. But knowing some like Be and B could be just as helpful, but I doubt memorizing all of them is necessary.

What is the best thing to study to be able to understand the exceptions?

[Ayesha Aslam-Mir 3C]

Is there a way to use either periodic table trends (or indications or orbitals) or just the character of an element to determine of it's an exception to the rule?

[Ayesha Aslam-Mir 3C]

I would agree with what was said above, the way to tell that they are exceptions is that if there is no way for the middle atom to achieve a full octet. You do not need to memorize all of them, I would say its more favorable if you recognize them instead.

Is this a way to tell for individual atoms with the same concept?

[Queena Chu 3E]

I think it's best to be able to recognize what exceptions there are.
Some excpetions include:
Molecules, such as NO, with an odd number of electrons
Molecules in which one or more atoms possess more than eight electrons, such as SF6
Molecules such as BCl3, in which one or more atoms possess less than eight electrons