The Lewis dot structure for NI3, the chemical formula for nitrogen triiodide, is written with an N in the center with three radiating lines to the three Is. Each I has three pairs of dots around it, while the N has one pair of dots around it.
N is the chemical symbol for nitrogen, and I is the chemical symbol for iodine. Each line represents a bonded pair of electrons, while each dot represents a valence electron. A valence electron is an electron in the outer shell of the atom. Nitrogen triiodide has a total of 26 valence electrons represented by lines and dots.