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Electron Dot Formula


Delocalized Bonding cannot be properly described by a single Electron Dot Formula. As an alternative, a resonance depiction is often used. Conferring to the resonance depiction, we can describe a molecules electron structure having delocalized bonding by noting down all conceivable Electron Dot Formula.

  • A Lewis Electron Dot Formula comprises of one dot for every valence electron and an element’s symbol. Stages to articulate the electron dot formula are stated beneath.
  • Note down a skeletal structure displaying a realistic bonding pattern by means of only the element symbols.
  • Pick up every valence electrons from every atom and toss them into a make-believe container that we can term an electron pot.

        Make use of the N – A = S equation to get to know the number of bonds

  •       The sum of the number of valence electrons is equal to N
  •       The number of valence electron in electron pot is A.
  •       The number of electrons shared in the molecule equals S
  •       Distribute the electrons from electron pot to account for the bonds
  •       Distribute the rest of the electrons



Solved Examples

Problem 1: In terms of electron dot formulas, define the electron structure of the carbonate ion CO32-.


One potential electron dot formula for the carbonate ion is



Since all carbon-oxygen bonds are likely to be equal, the electron structure in resonance terms is shown below.



Over the region of all three carbon-oxygen bonds, one electron pair is delocalized.

Question 2: Cyclopentane – What will be the formula and electron dot structure of this element?


Single bonds connect five carbon atoms of cyclopentane in a cyclic form. The molecular formula of cyclopentane is C5H10. The electron dot structure and structural formula of cyclopentane are articulated underneath.

Electron Dot Formula