Question

Why alkai metals have high electrical conductivity ?​

Answer 1

they have two valence electrons in their outermost orbit. As their ionisation potential is very low hence they can loose their valence electrons very easily therefore they have high electric conductivity.

Answer 2

Alkali metal,s atoms are embedded in a sea of electrons .As these metals from weak intermolecular bonds. The electrons easily move from one ion to other. So there is high electrical conductivity in the metal.