Step 1: Find valence e- for all atoms. Add them together.

Si:4

F:7x4=28

Total=32

Step2: Find octet e- for each atom and add them together.

S:8

F:8x4=32

Total=40

Step3: Gives you bonding e-. Subtract step 1 total from step 2

40-32=8e-

Step 4: Find number of bonds by diving the number in step 3 by 2(because each bond is made of 2 e-)

8e-/2= 4 bond pairs

Step 5: Find the number of nonbonding (lone pairs) e-. Subtract step 3 number from step 1.

32-8= 24e-=12 lone pair

Use information from step 4 and 5 to draw the lewis structure.

Silicon goes in the centre.

## Lewis dot structure of SiF_{4}

Alternatively a dot method can be used to draw the lewis structure.

Calculate the total valence electrons in the_{} molecule.

Si:4

F:7x4=28

Total=32

Put Silicon in center and arrange fluorine atoms on the sides.put a pair of electrons connecting each fluorine with oxygen and the remaining four electrons on fluotrine atoms.