Lewis Structures Worksheet

Lewis Structures WorksheetChem. 1-1NAME:____________________________________Class:__________Below is a strategy for drawing the Lewis Structures for Molecules.Determine the total number of valence electrons in the molecule.o Neutral species: sum of valence electrons VE of all atomso Positive ion: sum of VE of all atoms minus ionic chargeo Negative ion: sum of VE of all atoms plus ionic chargeDraw a reasonable skeletal arrangement using single bondso Smaller, more electronegative, atoms surround larger, less electronegative, atomso Oxygen, hydrogen, and/or halogen atoms typically surround a central atom in a symmetrical arrangemento Carbon atoms are usually bonded to each othero Oxygen atoms are not bonded together except in elemental oxygen and ozone.o In most compounds with both O and H, the H-atoms are all bonded to O-atomsSubtract two (2) electrons for each single bond in the skeleton structureDistribute the remaining electrons [in pairs as long as you can] to the connected outer species [attempt to satisfy the“octet rule” (EXCEPT for H)]o IF electron pairs are left over and all atoms have an octet, place on the central atomo IF insufficient electron pairs are available to satisfy the octet rule for the central atom, move electron pair(s)from the outer atom(s) to form multiple bond(s) between the central atom and an outer atom• It is quite common for C, N, O, S, P, Se to form multiple bondsCheck to see that all atoms have an octet and the correct numbers of available valence electrons were used.o Place polyatomic ionic compounds in brackets [ ] with the charge.1. Fill in the following table for each atom.Atom Group #Ca# Of ValenceElectronsElectron Dot Notation# Of PossibleBondsSeKrCCsAlFP2. Define the following:a. Chemical Formulab. Lewis Structure3. What are unshared pairs of electrons according to Lewis theory?4. What are unpaired electrons according to Lewis theory?

5. Use the strategy presented above to write Lewis structure for the following molecules designated bytheir Chemical Formulas.PH 3 CBr 4 SO 22-C 2 H 4 HNO 3NO 2-H 2 SO 4 N 2 SO 3 CO 32-6. What is meant by resonance?7. Which molecule(s) above exhibit resonance? DEFEND your answer.