# How do you draw an atomic level diagram for 2S+3O2=2SO3 ?

Nov 1, 2015

#### Answer:

I think you are asking how to show the way the atoms combine in the reaction.

#### Explanation:

The easiest way is first to break up the ${\text{O}}_{2}$ molecules into atoms.

$\text{O"_2 → 2"O}$

Then we can re-write the equation for the reaction as

${\text{2S + 6O → 2SO}}_{3}$

or

${\text{1S + 3O → 1SO}}_{3}$

The $\text{S}$ atom in ${\text{SO}}_{3}$ is in the middle with three $\text{O}$ atoms attached to it.

If we want to show how the atoms combine, the diagram might look like this:

Structure A isn't a good structure, because it doesn't give the $\text{S}$ atom eight valence electrons.

So we use a pair of electrons from an $\text{O}$ atom to form an $\text{S=O}$ double bond (Structure B).

Structure B still isn't the best structure for ${\text{SO}}_{3}$, but it gives every atom an octet in its valence shell.

If this isn't what you wanted, please let me know.