(2) Covalent bond. If two atoms each donate an electron that is shared with
the other atom, the bond is a covalent bond. An example of this is the bond between
two H (hydrogen) atoms. Double and triple covalent bonds are also possible.
Both atoms have 1 e- in the K shell.
By sharing their electrons each
hydrogen has 2 e in the K shell and
both are stable because of the
(3) Coordinate covalent bond. If one atom donates two electrons for sharing
with another atom (which donates no electrons), it is called a coordinate covalent bond.
An example of this type of bond between N (nitrogen) in ammonia and a hydrogen ion
H has an
By sharing the two e ,
has a complete
H+ has a completed K shell
and N still has a completed