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Hi, this is Dr. B. Let's do the Lewis structure for H2, Hydrogen gas. It's a quite explosive
gas, so please don't fill your blimp up with it. Let's look at the periodic table. Hydrogen
is in group 1, that means it has 1 valence electron. But we have 2 Hydrogen atoms, so
let's multiply that by 2, for a total of 2 valence electrons. So that's what we'll use
to form chemical bonds between the Hydrogens. So we'll draw our Hydrogens out right here.
We have 2 valence electrons. Let's start by putting a pair of electrons between the Hydrogens,
that bonds them together. We've used all our valence electrons up. The interesting thing
about Hydrogen is, it only needs two valence electrons to have a full outer shell. That
Hydrogen right there has two, and because they're sharing, that Hydrogen also has two.
That's the dot structure for Hydrogen gas. We could also write it as a structural formula
like this, right here, where these bonding electrons are represented by this line here.
That means two bonding electrons. So that's it. This is Dr. B., and thanks for watching.