Lewis Dot Structures of Atoms

In order to draw Lewis Dot Structures for atoms we use the Periodic Table to find the number of valence electrons for the atom. Once we know the number of valence electrons, we can easily draw the Lewis Structure.

Looking at the Periodic Table, atoms have a regularly occurring number of valence electrons based on their Group number.  

Group 1: One Valence Electron
Group 2: Two Valence Electrons
Group 13 (also called 3A): Three Valence Electrons
Group 14 (also called 4A): Four Valence Electrons
Group 15 (also called 5A): Five Valence Electrons
Group 16 (also called 6A): Six Valence Electrons
Group 17 (also called 7A): Seven Valence Electrons
Group 18 (also called 8A): Eight Valence Electrons*

* Although in Group 18, the element Helium only has two valence electrons.

In general we do not draw Lewis Structures for atoms of the Transition Metals (Groups 3-12).

--- Lewis Resources ----
• Lewis Structures for Ionic Compounds: How to Draw Lewis Dot Structures for ...
• Lewis Structures for Covalent Compounds: How to Draw Lewis Structures: Five Ea...
• Counting Valence Electrons: Finding the Number of Valence Electro...
• Calculating Formal Charge: Formal Charges: Calculating Formal Ch...
• Exceptions to the Octet Rule: Exceptions to the Octet Rule

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