In big enough and/or old enough stars, fusion can continue
to heavier elements than helium.
Another chemistry aside: Let's review
the periodic table of the elements.
The number of protons increases by one every time
you move to the next (highest) element in the
table. The number of electrons also increases,
to keep the electric charge equal to zero. The
number of neutrons also increases, but in a
less regular way.
Here
are
some
links
to dynamic web periodic tables.