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CO2 ??

C = O = C

That i, two C molecules form a double bond with one O to form CO2. E.D.S. :-

C :: O :: C


Hope that help! (: xx
cheers!

I agree. The carbon has no lone pair of electron hence it i linear

Carbon has nonbonding electrons

Each carbon gives 4 electrons ( 2 C = 8 electrons)
Oxygen gives 6 electrons
Total of 16 electrons

so you get

::C=O=C::

Which is linear (and of the Dh point group)

Carbon dioxide, CO2

Carbon dioxide could be drawn (without making any assumptions about the shape) as
:O=C=O:


The carbon originally had 4 electrons in its outer level (group 4). Each oxygen contributes 2 electrons - 1 for each bond. That means there are a total of 8 electrons around the carbon, in 4 pairs. Because there are 4 bonds, these are all bond pairs.

Each double bond uses 2 bond pairs - which are then thought of as a single unit. Those two double bond units will try to get as far apart as possible, and so the molecule is linear. The structure weve drawn above does in fact represent the shape of the molecule.

::O=C=O::
A non bonded C atom has 4 valence electrons. C atom, when forms one bond by sharing electrons, has 5 electron in it valence (outermost) shell. Similarly, by forming 4 bond, it has 8 electron in its valence shell, i.e., it achieve its octet.
Each O atom i also able to satisfy its octet by forming double bond with C (1 is sigma bond, the other is pi bond).
CO2 molecule is linear, it cant bend because of high strength of double bond over single and restricted rotation about pi bonds.