Neptunium was named after planet Neptune, but we put Neptune, the god of the sea on this square.   next element                           previous element

The bombardment of uranium-235 with neutrons produces a lot of energy: 235U + 1n –> 92Kr + 141Ba + 3 1n + LOTS of energy This nuclear reaction is used in nuclear power plants to provide energy for homes. next element                           previous […]

    Protactinium is a radioactive element.  Maybe that radioactive spider that bit Peter Parker was irradiated with Pa?! next element                        previous element

    Thorium is named after Thor, the god of thunder – or perhaps the superhero…? next element                          previous element

    Actinium is a radioactive element.  Here, you can see the symbol for radioactive materials on its square. next element                                    previous element