This is Dr. B. Let's do the Lewis structure
for SiH4.
On the periodic table, Silicon, group 4, 4
valence electrons; Hydrogen, group 1, 1 valence
electron, but we have four of them.
So 4 plus 4: 8 total valence electrons.
Put the Si in the center, Hydrogens always
go on the outside.
We have four of them.
So let's put two electrons between each of
the atoms there to give it a chemical bond.
Two, 4, 6, 8. we've used all eight valence
electrons.
Hydrogen only needs two electrons to have
a full outer shell, so each of the Hydrogens
is fine; it has a full outer shell.
And the Si needs eight, which it has.
So that is the SiH4 Lewis structure.
This is Dr. B., and thanks for watching.
