Why V can't have the valence 7 by taking an electron from the 3p orbital and putting it into 3d?

Does that happen because 3p already has a bond?




Vanadium has a stable valency of 5.  

Electrons cannot be transferred from $3p$ orbital to $3d$ orbital as the $3p$ orbital is completely filled and has attained stability.  

It requires high energy so as to transfer electrons from $3p$ orbital to $3d$ orbital.  

Hence,Vanadium has a valency of 5 only and not of 7 or 6.


 1