1. Drawing Lewis Dot Structures for Ionic Compounds

2. Ionic Bonding involves: TRANSFER of valence e- from metal atom to non-metal atom:

3. 2 step process: 1)
transfer of e- from metal to non-metal atoms
result: +/- IONS form 2)
electrostatic attraction between +/- ions
result: ionic bond forms

4. [Na]+1[ Cl ]-1 NaCl • • • • • • • •
remember: Lewis diagrams show valence electrons!

5. Predicting Ionic Compounds
What is the ionic compound formed from calcium and iodine?
calcium: metal with 2 valence electrons
- loses both electrons  [Ca]+2
iodine: non-metal with 7 valence electrons
- gains 1 electron  [ ‍I ]-1 •• • • • • ••
how many iodine ions are needed to make a
neutral compound? 2

6. Lewis Diagram of calcium iodide (CaI2)
[Ca]+2[:I:]-1[:I:]-1 or
[:I:]-1[Ca]+2[:I:]-1
note: total charge MUST add up to zero
since compounds are neutral ·· ·· ·· ·· ·· ·· ·· ··