Question

how many total lone pair of electrons in I3 MINUS

Answer 1

I₃⁻ is called as Tri Iodide ion

It has Total 9 lone pair electrons.
Three lone pairs are present on each of the iodide atom.
Its Linear in shape.

Answer 2

$I^{3-}$ or also known as the Triiodide ion is a chain of three iodine ions joined by single bonds. Each iodine ion has a total of nine lone pairs of electrons on $I^{3-}$.

This molecule can be prepared by treating iodine salt aqueous solutions with pure iodine. Due to the presence of lone pairs of electrons and its ion – ion repulsion, the iodine – iodine bond length in Triiodide ion is longer than normal iodine – iodine bond length.