This is a tough question because it's hard to say
what makes one atom better than
The atomic number of an atom is
equal to the number of protons that it contains.
So for example, oxygen, which is element number 8,
contains 8 protons. Uranium, which is element
number 92, contains 92 protons. Because protons
are positively charged, and atoms are electrically
neutral, there are also an equal number of
negatively charged electrons. The electrons are
much lighter than the protons and so don't
contribute much to the mass of an atom. In
addition, atoms contain neutrons, which have the
same mass as protons but are not charged - so
difference between the atomic mass and the atomic
number that you can read off your periodic table
tells you the number of neutrons.
more about protons and the structure of atoms,
there is a very good
to answer your question - I think you have to
decide this one for yourself! Take a look at the
periodic table and see if you think that the
heavier elements are "better" than the lighter
ones! It's a tough call!