  We investigate the existence of stable charged metallic bubbles using the
shell correction method. We find that for a given mesoscopic system of n atoms
of a given metal and q less n (positive) elementary charges, a metallic bubble
turns out to have a lower total energy than a compact spherical cluster,
whenever the charge number q is larger than acritical charge number q_c. For a
magic number (n-q) of free electrons, the spherical metallic bubble may become
stable against fission.
