Name Period Lewis Structures Worksheet Determine the type and number of atoms in the molecule. Write the electron-dot notation for each type of atom in the molecule. Determine the total number of valence of electrons available in the atoms to be combined. Draw a skeleton structure for the molecule. The central atom is usually the one that has the most unpaired electrons. Connect the atoms with electron-pair bonds 5. Add unshared pairs of electrons to complete the octet (duet) of the atom. 6. Make sure the number of electrons in your structure are the same as the total number of valence electrons available. 1. 2. 3. 4. 1) Cl (chlorine atom) 2) Mg (magnesium atom) 3) NF3 4) H2 5) HF 6) CH2F2 7) LiF (careful, this one is ionic!) 8) O2 (has double bond) 9) H2O 10) C2H6 11) N2 (has triple bond) 12) CO2 (has 2 double bonds) 1. What is the difference, in a covalent bond, between a shared pair and an unshared pair of electrons? 2. When drawing Lewis structures, which atom is usually the central atom?