OK, we're going to draw the dot structure
for Chlorine gas--a poisonous green gas.
This is Dr. B. And we'll start out by figuring
out how many valence electrons we have for
Chlorine.
On the periodic table, it's in group 7 or
17, so it has 7 valence electrons; but we
have two of them, so let's multiply that times
two for a total of 14 valence electrons.
So we're going to spread those around the
atoms, fill the octets, form a chemical bond.
So here's Chlorine, and another Chlorine.
Let's start by putting two valence electrons
between the Chlorines.
That forms the chemical bond.
And then we're going to spread them around
the outside atoms, trying to give each one
eight.
So we have 2, 4, 6, 8, 10, 12, 14.
We used all 14 up.
Now let's see if we have octets, eight valence
electrons around each.
That Chlorine has 8, and this Chlorine right
here, 2, 4, 6, has 8 as well.
So we've actually finished this Lewis structure
for Cl2; a pretty straightforward one.
And let's just count: 2, 4, 6, 8, 10, 12,
14.
So we're good there.
We could also draw it as a structural formula
that would look like this.
These two electrons right here would be represented
by a single line that shows you a pair of
valence electrons, and it shows that they're
bonded.
That's the Lewis structure for Cl2, Chlorine
gas.
This is Dr. B., and thanks for watching.
