Dot order

Moderators: Chem_Mod, Chem_Admin

Brett Lieuallen 2A
Posts: 50
Joined: Wed Sep 30, 2020 9:39 pm

Dot order

Postby Brett Lieuallen 2A » Fri Oct 30, 2020 4:55 pm

Do the dots in a lewis structure matter in the order they are positioned or added. For example for atoms in a period, does the order electrons are added matter beyond making sure an electron fills one of the four positions before the next set of four are added? And do the electrons that are going to be shared or given face toward the atom they are going to be shared/given to? Or does this not matter notation wise?

Chem_Mod
Posts: 19540
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 882 times

Re: Dot order

Postby Chem_Mod » Fri Oct 30, 2020 6:48 pm

Paired electrons need to be next to each other as a pair.

Unpaired electrons are indicated by single dots.

E.g., N atom has its 5 valence electrons indicated by one pair and three unpaired electrons.

Immi Lee - 1D
Posts: 98
Joined: Wed Sep 30, 2020 9:58 pm

Re: Dot order

Postby Immi Lee - 1D » Sat Oct 31, 2020 9:09 pm

I think the general rule I learned in my high school chemistry class is that you start with singular dots on top of the atomic symbol, then go clockwise putting another dot on each side of the atomic symbol. That way you put one dot on every side of the atomic symbol before adding dots to create paired electrons.

805593945
Posts: 43
Joined: Wed Sep 30, 2020 9:36 pm

Re: Dot order

Postby 805593945 » Sat Oct 31, 2020 9:16 pm

I don't think the order of the dot matter, though there is an obscure rule to it. I think you can apply Hund's rule to it, where each orbital should be occupied with one electron before you could add the second electron to the orbital. Similarly, each side of the symbol must have at least a dot before you could put the second dot or do the line (also mean 2 e-). This was what I learned in AP chem so. Hope it helps.

Michelle Nguyen 3F
Posts: 87
Joined: Wed Sep 30, 2020 10:03 pm

Re: Dot order

Postby Michelle Nguyen 3F » Sat Oct 31, 2020 11:05 pm

The only rule for the Lewis Dot structure that I remember is that the first four electrons have to fill up each of the four sides before adding on the next four. For the non-noble gases after four electrons, I don't think the placement of the electrons matter.

Sahiti Annadata 3D
Posts: 89
Joined: Wed Sep 30, 2020 10:01 pm

Re: Dot order

Postby Sahiti Annadata 3D » Sat Oct 31, 2020 11:16 pm

While people generally start at the top and go clockwise, it does not make a difference in the structure/composition of the compound.

Earl Garrovillo 2L
Posts: 91
Joined: Wed Sep 30, 2020 9:55 pm

Re: Dot order

Postby Earl Garrovillo 2L » Sun Nov 01, 2020 11:58 am

It really doesn't matter where the electrons are located or how they are filled. Though many use the start at the top and fill in a clockwise way to fill Lewis structures, at the end of the day, I think the dot orders are just a visual interpretation designed to easily see the valence e- of atoms/compounds. The only time where it would really matter is when there's bonds involved since those need to be placed in specific places.

Kyla Roche 2K
Posts: 93
Joined: Wed Sep 30, 2020 9:59 pm

Re: Dot order

Postby Kyla Roche 2K » Sun Nov 01, 2020 12:23 pm

I don't think the placement matters other than in covalent bonds, the dots in between the two atoms are the shared ones so keep that in mind!

Will Skinner
Posts: 84
Joined: Wed Sep 30, 2020 9:28 pm

Re: Dot order

Postby Will Skinner » Sun Nov 01, 2020 1:30 pm

The Lewis structures have two dot on each side of the element symbol. The electrons shared between atoms should face each other.

Claudia_Danysh_2B
Posts: 84
Joined: Wed Sep 30, 2020 9:58 pm

Re: Dot order

Postby Claudia_Danysh_2B » Sun Nov 01, 2020 6:12 pm

Ya usually I fill in the dots by only putting one on each side and then going around a second time so you I the right number of paired and unpaired electrons!

Jaclyn Schwartz 1I
Posts: 94
Joined: Wed Sep 30, 2020 9:45 pm

Re: Dot order

Postby Jaclyn Schwartz 1I » Sun Nov 01, 2020 11:08 pm

I don't believe there is any official rules to do it. Just that 2 dots are paired and a single is an unpaired electron, so make sure to keep track of that!

Darren1j
Posts: 107
Joined: Wed Sep 30, 2020 9:37 pm

Re: Dot order

Postby Darren1j » Sun Nov 01, 2020 11:29 pm

I was also going to ask if Hund's rule applies to Lewis dot structures because Lavelle had shown Oxygen with 3 pairs of electrons rather than 2 pairs and 2 single electrons around the O.


Return to “Lewis Structures”

Who is online

Users browsing this forum: No registered users and 2 guests