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CBSE Class 10 Answered

Explain how to make electron dot structure?
Asked by Shreyash Gajbhiye | 08 Mar, 2014, 05:24: PM
answered-by-expert Expert Answer

Follow these simple steps to draw dot structures:

  • Draw the atoms on paper and put dots around them to represent valence electrons of the atom. Be sure to have the correct number of electrons.
  • If the species is an ion, add or subtract electrons corresponding to the charge of the ion. Add an electron for every negative (-) charge, and subtract an electrons for every positive (+) charge.
  • Consider bonding between atoms by sharing electrons, some may come from one atom.
  • If possible, apply the octet rule to your structure. Some structures don't obey the octet rule, but explain why.
  • Assign formal charges to atoms in the structure.

Let us consider the electron dot structure of carbon tetrachloride, which is a non-metallic halide. 

  • Carbon has four electrons in its outermost shell, so it requires four more electrons to complete its octet. 
  • Chlorine has seven electrons in its outermost shell, so it requires one more electron to complete its octet.
  • Now, Carbon shares its four electrons with four chlorine atoms to achieve stable electronic configuration of eight electrons. In the process the four chlorine atoms too acquire the stable electronic configuration. The electron dot structure of Carbon tetrachloride can be drawn as:

 

 

Answered by | 09 Mar, 2014, 06:54: PM
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