What is the number of electrons shared between the atoms in i2 molecule (that is an i not a 1) 1) 7 2) 2 3) 8 4) 4

Iodine is one of seven elements that usually form as diatomic molecules. These other "diatomics" are  and . They typically bond to themselves.

Iodine has seven valence electrons. Using valence shell electron pair repulsion (VSEPR) theory, we can predict the Lewis dot structure for . We see there are fourteen electrons, and we can make a covalent bond, leaving three lone pairs on each atom. The bond replaces two electrons, so the number of electrons shared is two.

Ions gain or lose electrons

Ido not understand.