  The advances in the growth techniques provide numerous scope to explore the
possibilities of new 2D materials for potential applications. With the aid of
first-principle calculations we show that 2D Na can be a new addition to the
family of thermodynamically stable 2D materials for device applications. Not
surprisingly, due to half-occupied $3s$ orbital 2D Na possesses the features of
the 2D electron gas (2DEG). The transport properties are examined based on the
accurate solution of Boltzmann transport equation. With practically tunable
carrier density in 2D materials, the intrinsic electrical resistivity of
electron doped 2D Na is $\sim$ 1.4 times larger than that of graphene and falls
below the latter 450 K onwards. The Bloch-Gr\"uneisen temperature is almost
constant at 50 K, independent of the type or density of the charge carriers.
The electronic thermal conductivity of pure 2D Na is $\sim$ 1.24 times larger
than that of its bulk counterpart at 300 K. The Wiedemann-Franz law stands tall
in 2D Na with calculated Lorenz number 2.41 $\times 10^{-8} V^2/deg^2$ at room
temperature. The transport mechanism presented here is expected to occur in all
Na like systems with a clean Fermi surface.
