High electronegativity of nitrogen oxygen and fluorine. Or you can just use the periodic table. Lewis Structure Formal Charge Calculation Mnemonics Lewis Mcat Professional and Experienced Academic Writers. . The formal charges should match the electronegativity of the atom that is negative charges should be on the more electronegative atoms and positive charges on the least electronegative atoms if possible. The symbols used for writing the electron configuration start with the shell number n followed by the type of orbital and finally the. The species that contains 24 protons 26 neutrons and 22 electrons would be represented by. We must be careful not to confuse electronegativity and electron affinity. Fluorine has the highest electronegativity 40and caesium the lowest 079. Electronegativity versus Electron Affinity. Get All The Features For Free. If it has a positive one on the other hand it is more like...