Respuesta :

AL2006

There are 92 natural ones and about 20 more made in particle-Physics labs.

If we only stick to the 92 natural ones, then there are

       (92!) / (88! times 4!) = 2,794,155 possible answers to your question.

Here's one:    Osmium
                      Neodymium
                      Iridium
                      Gold .