Here's why:

* Hydrogen (H) has one valence electron.

* Iodine (I) has seven valence electrons.

* Bonding: Hydrogen shares its electron with Iodine, forming a single covalent bond.

* Lone Pairs: Iodine has three lone pairs of electrons.

* Shape: Since there's only one bond and no other significant electron groups around the central iodine atom, the molecule adopts a linear shape to minimize electron repulsion.

Think of it like two balls connected by a stick!