Write the Lewis dot structure of `CO_(3)^(2-)` ion .

Explanation

Using the first method
Step1 Total number of valence electrons in `CO_(3)^(2-) ion = 4 + [3 xx 6]+2`
`24 e^(-)'s`
Strep 2 The skeletal structure of `CO_(3)` is
`{:(,O,,,),(O,C,O,,):}`
Step 3 Put one shared pair of electrons between each `C` and `O` and complete the octet of `O`-atom

In the above structure octet of `C` is not complete Therefore multiple bonding is needed between `C` and O-atom. If a double bond between `C` and one O-atom is drawn, it will complete the octet, as shown
Second method `V("Total no. of" e^(-)'s)=1xx4 ("for C") + 3 xx 6`
(for O) +2 (for 2 (-ve) charge)
`24 e^(-') s`
step `O("Total no of "e^(-') s" for octet")`
`=1 xx 8 (forC) + 3 xx 8` (for oxygen)
`32 e^(-')s`
S (Shared `e^(-')s)`
`=(O -V) =(32 -24) =8 e^(-') s`
Skeletal structure with shared `e^(-')s`
step 5 `U ("unshared" e^(-')s ) = (V-S) = 24 -8 =16 e^(-')s`
Add 16 unshared `e^(-')s` to complete the Lewis structure