During a reaction chlorine atom is in $2^{nd}$ exited state. The number of paired electrons is that atom in valency shell in ____

The general electronic configuration of chlorine is [Ne]3s²3p⁵ .

When electrons are excited in chlorine, the electrons enter into 3d subshell then the electronic configuration of chlorine is given as:

[Ne]3s²3p³3d²

Thus the number of paired electrons will be 4, 2 and 0 in first , second and third excited states respectively