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How many total of CO^3 2- valence electrons?What is lewis structure?What is molecular...

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babygurl175 | Student, Undergraduate | (Level 1) eNoter

Posted October 31, 2012 at 2:43 PM via web

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How many total of CO^3 2- valence electrons?What is lewis structure?What is molecular shape?What is bond angle?Is CO^3 2-polor or non-polar?

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jerichorayel | College Teacher | (Level 1) Senior Educator

Posted November 2, 2012 at 12:22 PM (Answer #1)

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CO3^2- is called a carbonate ion. First we need to count the total number of valence electrons. We just add the valence electrons of each atoms involved.

C = 4

O = 6 x 3

e = 2 ---> we add electrons when the charge of the ion is negative, in

              this case it is negative 2 so we add two electrons.

------------

    24 electrons

Next, we have to assign the central atom; In this case it is C.

Now we have to connect the atoms and form bonds. We can form one C=O and two C-O bonds.

          

   O = C - O

          |

          O

Finally, we have to distribute the remaining electrons on C atoms provided that it follow the octet rule. 

   ..           ..

   O = C - O  :

   ''      |    ''

       :  O  :

           ''

CO3^2- has a geometry of trigonal planar and has a resonance. It has a bond angle of 180 degrees and the molecule is polar.

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