[bb]

i have no idea.. plzz help? is it bent?

[nj_bartel]

Sounds like an impossible structure to me

[cth]

I did a small Hartree-Fock computation on H₂O and H₂O^-.

For H₂O: O-H distance is 0,95Å and H-O-H angle 105,5 (compare with measured distance 0,9584Å and angle 104,45)
For H₂O^-: O-H distance is 1,03Å and H-O-H angle 99,9

The extra electron goes into an anti-bonding orbital which push the two hydrogen atoms closer to one another. Not surprisingly, this anion is not stable.

[sjb]

i have no idea.. plzz help? is it bent?

Do you mean OH₂^- (water, with an additional electron)? or OH^2- (hydroxide, also with an addtional electron)? How many atoms are there in your ion?

[cth]

Yes, the title is confusing but I guess he meant H₂O^-.

There is no sense to ask the geometry and angle of a diatomic compound which would necessarily be linear.