Question

Someone super smart plzzzz help

Can bond order be a negative value?

Answer 1

MO theory? if the bond order of a molecule is negative it means that the molecule is unstable and does not exist like He2

Answer 2

Oh thanks..... can i ask you another question?

Answer 3

yeah, sure

Answer 4

For the H2+ molecule, absorption of light can cause an electron to be promoted from the
σg to the σu* orbital. The equilibrium bond length for the resulting excited molecule will
be:

Answer 5

a. shorter than for H2+ in the ground state.
b. longer than for H2+ in the ground state.
c. equal to that for H2+ in the ground state.
d. None of the above. The molecule is not stable and the will fall apart.

Answer 6

I'm pretty sure it's d, since the system only has 1 electron, and it is in the anti bonding orbital. I'm studying this stuff myself right now, i have midterm on it tmrw

Answer 7

Nice.....hmmm..... goodluck......My prof just started on MO theory like a few days ago.

Answer 8

thanks dude

Answer 9

What is the bond order of the excited H2+?

Answer 10

to my knowledge it would be (0-1)/2= -1/2

Answer 11

A unstable molecule.....hmmmm...... have you had these types of negative bonding order questions before?

Answer 12

yeah, predicting whether a molecule will exist in real life or not, and proving it. it's more useful than VB

a molecule will exist if it's bond order is >0

Answer 13

MO also shows the paramagnetic property of O2

Answer 14

Paramagnetic = unshared electrons ?

Answer 15

unpaired

Answer 16

ohhhhh thanks..... like He2+?

Answer 17

yep

Answer 18

One more question: Bond stretching (asymmetrical, symmetrical, etc) will give higher frequencies if the bond strength is strong?

Answer 19

the energy or frequency that characterizes the stretching vibration of a given bond is proportional to the bond dissociation energy. straight from my notes; triple>double>single in terms of frequency. similar bond order equates to the strength

Answer 20

similarly* not similar

Answer 21

GOTCHA!!!! You da man.....i hope you ace this exam!

Answer 22

thanks dude! have a good one

Answer 23

Thanks :D I really do appreciate your help! have a good night!

Answer 24

no problem man, i like explaining stuff b/c it reinforces my knowledge and i'm able to word things better during examinations. night dude!