Uploaded August 2025 | Updated September 2026, 2 weeks ago
Drawing Lewis Dot Structures for Atoms
Dr. DeBacco
Guide to Drawing Lewis Dot Structures for Atoms
A Lewis dot diagram, is a visual representation of the valence electrons in a molecule, showing how they are arranged around individual atoms and how they participate in chemical bonds.
These structures use dots to represent valence electrons and lines (or pairs of dots) to represent shared electron pairs in covalent bonds
Find the Element on the Periodic Table
The group number (column) tells you how many valence electrons the atom has.
Example: Oxygen is in Group 16 → 6 valence electrons.
Write the Element’s Symbol
This represents the nucleus and inner electrons.
Example: For oxygen, write “O”.
Place Dots Around the Symbol
Each dot represents one valence electron.
Place up to two dots per side (top, bottom, left, right).
Spread them out before pairing.
Example: Oxygen gets 6 dots: one on each side, then start pairing
Remember…
Group 1 (ex. H, Li) → 1 valence electron → 1 dot
Group 2 (ex. Be, Mg) → 2 valence electrons → 2 dots
Groups 13–18 → 3 to 8 valence electrons → 3 to 8 dots
Helium (He) is an exception: only 2 valence electrons despite being in Group 18.
Link to Lecture Slides: drive.google.com/file/d/1fH3nu6knZuCNt8P85VMBbZE3W0uIwM9I/view?usp=drive_link
*Due to the description character limit the full work cited for "Drawing Lewis Dot Structures for Atoms" can be viewed at... docs.google.com/document/d/1FdoWwLtN0PiB_rDdCFTcjIMaYUe4wUEz/edit?usp=drive_link&ouid=104237452697237972847&rtpof=true&sd=true
Drawing Lewis Dot Structures for Atoms
Dr. DeBacco
Guide to Drawing Lewis Dot Structures for Atoms
A Lewis dot diagram, is a visual representation of the valence electrons in a molecule, showing how they are arranged around individual atoms and how they participate in chemical bonds.
These structures use dots to represent valence electrons and lines (or pairs of dots) to represent shared electron pairs in covalent bonds
Find the Element on the Periodic Table
The group number (column) tells you how many valence electrons the atom has.
Example: Oxygen is in Group 16 → 6 valence electrons.
Write the Element’s Symbol
This represents the nucleus and inner electrons.
Example: For oxygen, write “O”.
Place Dots Around the Symbol
Each dot represents one valence electron.
Place up to two dots per side (top, bottom, left, right).
Spread them out before pairing.
Example: Oxygen gets 6 dots: one on each side, then start pairing
Remember…
Group 1 (ex. H, Li) → 1 valence electron → 1 dot
Group 2 (ex. Be, Mg) → 2 valence electrons → 2 dots
Groups 13–18 → 3 to 8 valence electrons → 3 to 8 dots
Helium (He) is an exception: only 2 valence electrons despite being in Group 18.
Link to Lecture Slides: drive.google.com/file/d/1fH3nu6knZuCNt8P85VMBbZE3W0uIwM9I/view?usp=drive_link
*Due to the description character limit the full work cited for "Drawing Lewis Dot Structures for Atoms" can be viewed at... docs.google.com/document/d/1FdoWwLtN0PiB_rDdCFTcjIMaYUe4wUEz/edit?usp=drive_link&ouid=104237452697237972847&rtpof=true&sd=true
