Hi, this is Dr. B.
We're going to do the Lewis structure for
HF, hydrofluoric acid.
This stuff melts glass.
Very cool.
Start out looking at the periodic table.
Hydrogen is in group 1 so it has 1 valence
electron, and then Fluorine is in group 7,
sometimes called 17, so it has 7 valence electrons.
One plus 7 equals 8.
So we have a total of 8 valence electrons
to work with.
So we could start by drawing the H and then
the F, and we'll put electrons (we have 8);
let's start putting two here, bond the H and
the F together.
And that actually fills the outer shell of
Hydrogen there, which only needs two.
So we have 8 total, we've used 2, 4, 6, 8.
And it looks like the Fluorine has 2, 4, 6,
8 and the Hydrogen has two.
We've satisfied the octet, and 2, 4, 6, 8;
we've used all 8 valence electrons.
You could also write this as a structural
formula that would look like this right here,
where these two electrons would be represented
by that straight line there, that single bond.
That's the Lewis structure for hydrofluoric
acid.
This is Dr. B., and thanks for watching.
