Covalent bonds
What about reactions between 2
nonmetals?  Many nonmetals
do bond together.  Hydrogen
atoms, for example, often react
with other hydrogen
atoms.  Which will become
positively charged and which
negative?  Actually
neither.  Neither atom has any
stronger pull (or affinity) for
electrons than the other, so
these reactions do not form
ions.  In fact, the 2 atoms share
each others' electrons in what is
called a covalent bond.