The five stable isotopes are in the range of 176 to 180.

There are 80 known elements which have at least one stable isotope.

In nature it is found as a mix of seven stable isotopes.

There are some elements with six or more stable isotopes.

There are lots of elements with no known stable isotopes.

All period three elements occur in nature and have at least one stable isotope.

They occur among the 80 different elements that have one or more stable isotopes.

Scientists had thought that heavy and stable isotopes should exist.

And finally, is the distribution of stable isotopes universal or particular to earth?

N-15, the stable isotope of nitrogen, has also been used.