The Lewis dot structure for xenon tetroxide, written by chemical formula XeO4, has an Xe in the center with four radiating lines leading to four Os, each of which is lined by three sets of dots. The Xe represents the xenon atom and the four Os represent the oxygen atoms.
Each line represents a pair of bonded electrons. Each dot represents a valent electron, which is an electron in the outer shell of the atom. Counting each dot as one electron and each line as two electrons, the total number of electrons represented in the Lewis structure should equal the total amount of valence electrons in the molecule.