They all have a link to the periodic table ... they glow like this because curium is really radioactive and therefore toxic. It’s also been to space on numerous occasions.

Ram Mohan looks at how bismuth — a remarkably harmless element among the toxic heavy metals in the periodic table — has sparked interest in areas varying from medicinal to industrial chemistry.

Stable isotopes are non-radioactive forms of atoms ... Eighty out of the first 82 elements in the periodic table have stable isotopes. Measuring and analysing their distribution allows for many ...