Which isotopes of aluminum are radioactive?

1 Answer
Jun 20, 2016

Answer:

You might get a better answer on the physics forum, but AFAIK radioactivity is not related to unequal numbers of nuclear protons and neutrons.

Explanation:

The common radioactive isotope of #Al# is #""^26Al#, since #Z=13#, there are necessary 13 neutrons in this #Al# nucleus.

As said, radioactivity is not related to unequal numbers of protons and neutrons, but a non optimal combination of both or an excess of energy (metastable). Protons are positvely charged and repel each other. The more protons you try to fit into the nucleus (higher Z-values) the more neutrons you need to keep them together. You can see neutrons as the glue of the nucleus.