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📘 Lewis structures are electron bookkeeping

A Lewis structure is electron bookkeeping — not a photograph of electron density or a geometry diagram.

4
lessons
~20 min
to learn
Adults
level
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What you’ll learn

  1. Count electronsTotal valence electrons, including ion charge.Group numbers and charge adjustments set the electron budget.
  2. Place lone pairsComplete terminal octets and add multiple bonds when needed.Terminal atoms first, then central leftovers, then double or triple bonds.
  3. Check formal chargeCalculate formal charges and compare plausible drawings.Smaller magnitudes and electronegative negative charges often look more plausible.
  4. Audit the structureCheck octet exceptions and separate Lewis work from shape.A repeatable audit beats memorizing isolated examples.

Questions this course answers

What should you do first for a Lewis structure?

The total electron budget controls every later bond and lone-pair placement.

How does a negative ion change the electron count?

A negative charge means the species has gained electrons.

What does one line between atoms represent?

A bond line is shorthand for two shared electrons.

What must the sum of formal charges equal?

Formal charges are bookkeeping values whose sum must reproduce the molecular or ionic charge.

What does resonance mean in a Lewis model?

Resonance contributors keep the nuclei connected the same way while redistributing electrons.

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