Bond Order from Lewis Dot Structure - Chemical Bonding Video Lecture | Inorganic Chemistry

we want to find out what the bond order
is so you gotta draw the lewis structure
for all these sort of questions lewis
structure comes first nitrogen is in
column 5 is one of them oxygens in call
six six three of them and then plus one
for that - charge that will be like this
uh a 20-18 is for 24 hopefully nitrogen
is in the middle oxygens all around
two four six I'll draw the bonds first 6
of 24 6 8 10 12 14 16 18 20 22 24 do I
need to fix it anymore
or is it ready yes it's picked that's
what I asked you here because okay fix
that
in there we go I could have a resonance
structure to this if I wanted to fix it
with the oxygen on the left hand side or
I can have another resonance structure
if I wanted to fix it with a different
oxygen say the ostrich on the block
so those are three resonance structures
okay now if you want in the bond order
of this what I would do is just since
all the bonds are equivalent I would
just pick one of your face your favorite
looking bond since they're all
equivalent so let's just take this first
one here it's 1 here 2 here and 1 here 1
plus 2 plus 1 divided by the total I'm
essentially taking the average there's
three total that's four thirds or 1.3
any questions yeah um how did we know to
choose the ramp on oh okay it doesn't
matter yeah you can try this one too
okay plus one plus one divided by three
so we get 4/3 on the bottom one one plus
one plus two