In HClO4 Cl forms one single bond with an oxygen and three dative bonds with the other 3 oxygen atoms.
However, according to VB theory, Cl is hybridized and forms double bonds instead of dative bonds.
Then, the structural formula of the molecule never shows arrows as it would if there were...
I'm Antonio (born in 2007), from Italy and I'm currently attending the third year of high school (scientific type).
Physics is not my main interest, I prefer biology, but anyway I'm trying to understand as much as I can about this subject, that's why I joined.