Memory Game Lewis StructuresOnline version Formal Charges, Resonance structures by Marissa Corr How many single bonds and how many lone pairs does HCl contain? zero on all elements, or has the negative charge on the most electronegative atom. # valence electrons - 1/2(# bonding e's) - (# non-bonding e's) 18 The most stable resonance charge has a formal charge that is: 3, 1 Tetrahedral Bent What is the mathematical process of finding the formal charge of Cl in HCl? The molecular geometry of SO2 is 7- (.5)(2) - 6 =0 The molecular geometry of CF4 is 1, 2, 8 Formula for formal charge 1, 3