Emily Chirila 2E
Posts: 112
Joined: Sat Jul 20, 2019 12:16 am

I've been trying to do this homework problem and seriously struggling. I understand what a radical is but I cannot seem to figure out why NO2- is a radical. I drew the lewis structure but I don't see any unpaired electrons. Can anyone explain why NO2- is a radical?

Alexis Webb 2B
Posts: 124
Joined: Thu Jul 11, 2019 12:15 am

### Re: Radicals: Homework Problem #2C1

Jorge Ramirez_4H
Posts: 54
Joined: Wed Nov 21, 2018 12:19 am

### Re: Radicals: Homework Problem #2C1

Are radicals that important for the midterm?

Jocelyn Thorp 1A
Posts: 103
Joined: Wed Sep 18, 2019 12:20 am

### Re: Radicals: Homework Problem #2C1

Jorge Ramirez_4H wrote:Are radicals that important for the midterm?

I'd like to know this as well. Will we be expected to select what compounds are radicals or not? And does this knowledge have some other application?

Daniel Martinez 1k
Posts: 50
Joined: Wed Sep 18, 2019 12:16 am

### Re: Radicals: Homework Problem #2C1

NO2- is not a radical. It has 18 electrons, all of which are paired.

Emily Chirila 2E
Posts: 112
Joined: Sat Jul 20, 2019 12:16 am

### Re: Radicals: Homework Problem #2C1

Alexis Webb 1B wrote:In the answer key, it says it’s not a radical.

Weird. On my sapling online textbook answer key it said it is a radical:

2C.1 Only (a) and (b) are radicals

But I understand that it isn't a radical.. maybe just a mistake?

Megan Vu 1J
Posts: 101
Joined: Thu Jul 25, 2019 12:15 am

### Re: Radicals: Homework Problem #2C1

For this question, it is evident that only B and C are radicals because they have one electron leftover that isn't paired. The answer key must be a mistake since NO2- does not have any radicals in it. It is important to note that when drawing lewis structures, you should be able to see an odd number of electrons for one to be leftover for a radical.

aishwarya_atmakuri
Posts: 101
Joined: Sat Jul 20, 2019 12:15 am

### Re: Radicals: Homework Problem #2C1

NO2- has 18 electrons. Since 18 is an even number, there aren't going to be any unpaired electrons, so it would not be a radical. NO2 on the other hand would have an unpaired electron, so it would be a radical.

Kristina Rizo 2K
Posts: 105
Joined: Wed Sep 18, 2019 12:19 am

### Re: Radicals: Homework Problem #2C1

Can someone explain how d isn't a radical. The structure should be of HOCO. I did it and i got H-O-C-O with 2 pairs of electrons on each O and with one lone pair on C, which should make it a radical right?