10.1 - Depicting Molecules and Ions With Lewis Dot Structure

define resonance structure

when can write lewis structure in more than 1 way. BUT OVERALL CHARGE MUST REMAIN THE SAME

how to calculate fractional bond orders

#of bonds/ # connections

equation to calculate formal charge

# of valence electrons - # of lone atoms - # of bonds

share the rules for choosing the most valuable resonance form

1. smaller charges (+ or -) are preferred

2. Avoid like charges on adjacent atom

3. A more negative formal charge should reside on most electronegative atom

what are the electron-deficient atoms (WHEN BONDED COVALENTLY) and what # is the necessary electrons

Be (only 4 electrons)

B (only 6 electrons)

define free radical. Are the reactive?

a molecule with an unpaired electron and they are reactive.

what atoms have an expanded octect

1. atoms with d orbitals

2. nonmetals from period 3 (row) or higher