Question

any lewis structure drawing method that works -for instance OPF3

Answer 1

foance how do you draw OPF3

Answer 2

Well, I guess you could always do the old method of bars and dots. I'm still in high school, though, so I don't really know of any other method. Sorry! :(

Answer 3

I don't really know what I do for drawing lewis structures because I just have the feel for it, but here's a great page with steps and an example...
http://misterguch.brinkster.net/lewisstructures.html

Answer 4

can you draw your feelings step by step for OPF3

Answer 5

:) I like how you put "feelings" - that was good

Answer 6

lol, I can never put my feelings into words ;/
For drawing OPF3, this is what goes on in my head:
1) P is the central element.
2) Each of the 3 fluorines will have a single bond.
3) Giving the OP a double bond will balance everything out. Sorry for my terrible computer drawing.

Answer 7

So you basically just guess th sturcture

Answer 8

btw isnt there 10 electrons on P?

Answer 9

How do you know it is an exception to octet rule?

Answer 10

Well, after drawing so many, I have an intuitive sense of how things should be, but my steps do seem like I just guess it, lol.

Answer 11

Yeah, Phosphorus has 5 valence electrons and it can violate the octet rule. It happens a lot with compounds like PCl5, P2Cl4, PCl3, etc.

Answer 12

Well, PCl3 doesn't violate, but there's a free pair that's probably gonna be forming coordinate covalent bonds.

Answer 13

To write the Lewis type electron complex molecules or ions follow the following series of practical rules:
We add valence electrons of atoms in the molecule. If we have an anion, add as many additional electrons, as is the electric charge of the anion and and if cation we remove as many electrons as the charge of the cation.
eg we have to SO2: 6 + 2 • 6 = 18 valence electrons
Similarly, the SO42-: 6 + 4 • 6 + 2 = 32
and NH4 +: 5 + 4 • 1 - 1 = 8
we select the central atom of the compound. Central atom is what has index 1 in the molecular formula of the compound. If two atoms with index 1, pick one that is less electronegative. The selection process of the central atom excluded the hydrogen atom. Eg HNO3 in the central atom is N.
Bond the central atom to the regional atoms with simple links (links pairs of electrons). Where we have oxygen and hydrogen in the league, usually connect the hydrogen atoms to oxygen atoms and those with the central atom.
remaining electrons are placed in pairs (non-bonding electron pairs) in the regional people to fill the layer with 8 valence electrons of (except the atom who added the two). In the main atom you put excess electrons, even if we have to overcome the octet of electrons.

If the central atom has fewer than 8 electrons, try to double or triple bonds to cover the deficit of the electron.

Also, the halogens on the edge of the molecule of a compound having three non-bonding electron pairs and a simple electron pair bond.

Answer 14

Octet rule applies strictly to elements in the second line of the periodic table, but can be broken with elements in the 3rd one. This is particularly true for phosphorus and sulphur which both make lots of compounds.