Lewis Structures Hydrogen and the halogens bond once

Lewis Structures

– Hydrogen and the halogens bond once. – The family oxygen is in bonds twice. – The family nitrogen is in bonds three times. The family carbon is in bonds four times. – Hydrogen will never be in the center – Otherwise, start with the first element in the formula in the center

• Draw the EDD for each atom in the compound • Add up the number of electrons in the compound. • Put the first non hydrogen element in the center and build off of it. • Bond any free electrons together as a bond • Make sure that each element obeys the octet rule • A resonance structure is a structure that occurs when it is possible to write two or more electron dot diagrams for the same molecule or ion

Resonance Structures • A resonance structure is a structure that occurs when it is possible to write two or more electron dot diagrams for the same molecule or ion

Lewis Structures 1. First figure out the total number of electrons available for bonding by writing the electron dot diagram for each element 2. Next figure the total number of atoms to get the noble gas configuration for each atom. 3. Subtract the first number from the second to get the total number of bonding electrons. 4. Divide that by 2, that is the number of bonds in the Lewis structure 5. When writing the bonds, hydrogen and halogens bond once, oxygen group bonds twice, nitrogen group 3 times, and carbon group 4. 6. To get the number of unbonded electrons, subtract 3 from 1 7. Pick the central atom, and write it first 8. Write in the bonds to give noble gas configuration 9. Write in any unshared electron pairs.