Ler asked in Science & MathematicsChemistry · 8 years ago

For NCS- Lewis structure, why is C in the middle?

I know the least electronegative atom goes in the middle.

I thought that C would be more electronegative than S because it is smaller in size and therefore has greater nuclear charge.

3 Answers

  • 8 years ago
    Favorite Answer

    Look at the resonance structures for the ion shown here:


    Other if you switch the N and the C, the nitrogen would always have to bear a positive charge, which would be a higher-energy state and thus less favored.


  • 4 years ago

    Ncs Lewis Structure

  • Anonymous
    4 years ago

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