Which type of substances have chemical bonds that are not directional and valence electrons that move freely between the atoms?
a) halogens
b) nonmetals
c) metals
d) salts

c) metals

Explanation:

In metallic bonding there are delocalized electrons that are shared by a number of metal cations. The electrons are free to move and are not confined to a single metal cation. These free flowing electrons give metals its specific properties such as ductility, malleability, electrical conductivity and more.

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.