Steps to write Lewis structure
https://youtu.be/h16FM6y6uwI
https://youtu.be/iPW7VbOw5Vc
Show COCl2 structure
1. count valence
electrons
Add and subtract
electrons for ions
2. Select central
atom and put
others around it.
C
O
Cl
Cl
Show COCl2 structure
C
3. Put 2
electrons
between two
atoms.
4. Put electrons on
terminal atoms to
fulfil octet rule.
Remaining electrons
are on central atom.
O
Cl
Cl
Show COCl2 structure
C
5. Check all
atoms to fulfill
octet.
6. Make multiple
bond (if needed).
O
Cl
Cl
Formula and Name of
simple compounds
Formula of covalent compounds
For simple compounds, list
element with the lowest
electronegativity first.
Hydrogen is excepted, look
at the chart on the right.
The central atom usually
comes first.
Formula of covalent compounds
For simple compounds, list element with
the lowest electronegativity first.
Hydrogen is excepted, look at the chart on
the right.
The central atom usually comes first.
CO2
SF6
CH4
CCl4 N2 O4 HCl
Name binary covalent compounds
Name the element as listed
in the formula, change the
ending for the second
element to “__ide”.
Give the number of atoms
using the Greek prefix.
Mono is usually used with
the second element only.
Use prefix to indicate the
number of atoms.
Name binary covalent compounds
Use prefix to indicate the
number of atoms.
Common names (not follow the rule)
H 2S
hydrogen sulfide
HCl
hydrogen chloride
CH4
methane
Name of common acids
Test your understanding
1. Give the name of the following compounds.
SeF6
P2 O 5
N 2S5
2. Show the formula of the following compounds.
Disilicon hexabromide
Xenon tetrafluoride
Antimony tribromide