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### Lewis Structures

Posted: Fri Oct 26, 2018 2:02 pm
When Professor Lavelle was doing the Lewis structures in class today, the only thing I was confused on was how he knew how many dots to put around each element?

### Re: Lewis Structures

Posted: Fri Oct 26, 2018 2:21 pm
The number of dots that are put around each element relates to the number of valence electrons that element has. For example, C has 4, N has 5, O has 6, F has 7 valence electrons. The number of valence electrons correlates with the number of the column (group).

### Re: Lewis Structures

Posted: Fri Oct 26, 2018 4:02 pm
The number of dots (electrons) around en element correspond to the total number of valence electrons so after you've established the central atom and bonded the other atoms around the central atoms you add the remaining electrons (total valence electrons minus bonded electrons) to the other atoms surrounding the central atom, but keep in mind the octet rule stating you need 8 electrons to complete an octet, therefore adding electrons to the atoms according to the electrons needed to fill an octet.

### Re: Lewis Structures

Posted: Sun Oct 28, 2018 5:00 pm
The number of dots is the number of electrons for that element.

### Re: Lewis Structures

Posted: Sun Oct 28, 2018 5:27 pm
The number of dots around the nuclear symbol of an element corresponds with its number of valence electrons.
Tip: Remember that for all elements (except for hydrogen and helium), the outer shell would fill up to 8 valence electrons. However, always start with one on each side (the first 4), then pair them up (2 on each side).

### Re: Lewis Structures

Posted: Sun Oct 28, 2018 5:49 pm
the number of electrons is equivalent to the amount of valance electrons the element has

### Re: Lewis Structures

Posted: Sun Oct 28, 2018 5:55 pm
The number of dots is the number of valence electrons the element has. Since most elements obey the octet rule, they would want 8 electrons (whether they're in the form of bonds or lone pairs)

### Re: Lewis Structures

Posted: Sun Oct 28, 2018 6:21 pm
One dot = one valence electron
If an atom has four valence electrons, then four dots are drawn around the symbol!

### Re: Lewis Structures

Posted: Sun Oct 28, 2018 9:26 pm
Each dot represented a valence electron (the number of electrons in the outermost orbital), for single atoms/elements, this is the atomic number, but for bonds, we use the sum of the atomic numbers of the elements presented in the problem.