covalency
Specifies the degree of covalent character of a bond.
A fully ionic bond might have covalency equal to
0.0,
while a fully covalent bond might have covalency equal to
1.0.
Example: <bond ... covalency="0.5"/> (no default)
Allowed values: positive real (optional)
order
Specifies the bond order,
1.0 for a single bond,
2.0
for a double bond,
3.0 for a triple bond and
1.5 for
a benzene aromatic bond.
In
wired mode, single, double and triple bonds are
described by one, two and three paralel lines, respectively.
In
solid mode, a single bond is described by a cylinder,
a double bond has two additional cylinders coming slightly
outside of the central cylinder, opposite to each other,
and a triple bond has two more additional cylinders, all
four making angles of 90 degrees between them.
Example: <bond ... order="1.0"/> (default)
Allowed values: positive real (optional)