1agree with avik.
What is the shape of I3- ?
What is the geometry of I3- ?
When do we write TBP and when linear,i.e in which case we consider l.p's ?
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1if iodine is dissolved in KI, the triiodide ion I3- is formed.
the I3- ion has 3 atoms and must be either linear or angular in shape.It is convenient to consider the structure in a series of stages - first an I atom , then I2 molecule , and then I3- ion made up of an I2 molecule with an I- ion bonded to it by means of a coordinate bond
I2 + I -→ [ I→I--I ] -
Shape is based on a trigonal bypyramid.
To minimise the forces of repulsion three lp occupy the equatorial positions , and I atoms are located at the centre and in the two apical positions.The ion is therefore linear in shape, with a bond angle of exactly of 180°
1agree with manmay .. but is it tht always a triiodide ion will be formed !! -- jst a doubt :)