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


Practise This Question

If the systolic pressure is 120 mm Hg and diastolic pressure is 80 mm Hg, the pulse pressure is