  In the standard approach to defining a Planck scale where gravity is brought
into the quantum domain, the Schwarzschild gravitational radius is set equal to
the Compton wavelength. However, ignored thereby are the charge and spin, the
fundamental quantized aspects of matter. The gravitational and null-surface
radii of the Kerr-Newman metric are used to introduce spin and charge into a
new extended Planck scale. The fine structure constant appears in the extended
Planck mass and the recent discovery of the $\alpha$ variation with the
evolution of the universe adds further significance. An extended Planck charge
and Planck spin are derived. There is an intriguing suggestion of a connection
with the $\alpha$ value governing high-energy radiation in Z-boson production
and decay.
