Write the Lewis dot structure of $CO$ molecule.

(N/A) Step $1$. Count the total number of valence electrons of carbon and oxygen atoms. The outer (valence) shell configurations of carbon and oxygen atoms are: $2s^{2} 2p^{2}$ and $2s^{2} 2p^{4}$ respectively. The valence electrons available are $4+6=10$.
Step $2$. The skeletal structure of $CO$ is written as: $C-O$.
Step $3$. Draw a triple bond between $C$ and $O$ atoms to satisfy the octet rule for both. Each atom contributes electrons to form three shared pairs,and each atom retains one lone pair.
The Lewis dot structure is: $:C \equiv O:$