Set here the bond properties related with its charge distribution.
Covalency
Covalency is a measure of the percentage ionic/covalent character
of a bond. Currently no default value is provided.
Order
Order represents the chemical bond order. Although any positive
number is allowed, the usual values are
1.0 (single bond, the
default),
2.0 (double bond),
3.0 (triple bond) and
1.5 (aromatic or delocalised bond).
Single, double and triple bonds are rendered in
Wired mode,
as single, double and triple rasterized lines. In
Solid mode,
single bonds are represented by a cylinder (the sigma bond), double
bonds have two additional curved volumes on each side (the pi bond),
and triple bonds have two more curved volumes on each side (the
second pi bond).
Currently, the orientation of the curved volumes in solid double bonds
is arbitrary and aromatic bonds are visually handled as normal bonds.