Lanthanides and Actinides probably
Radioactive elements exist in all groups of the periodic table.
The 85th element on the Periodic Table of Elements is astatine (At). It is a highly radioactive element and the heaviest known halogen. Astatine is rare and is primarily produced as a result of decay processes in uranium ores.
The eighty ninth element in the periodic table is Actinium, with the symbol Ac and atomic number 89. It is a radioactive element that is part of the actinide series.
No, carbon is not the first element on the periodic table of elements. Hydrogen is the first element on the periodic table.
Group 3 of the periodic table contains many of the radioactive elements.
Radioactive elements exist in all groups of the periodic table.
periodic table is an arrangement of elements. Thiamin is not an element and hence not on the periodic table.
Francium (Fr) is a natural radioactive element, extremely rare.
Bismuth
There is NO element in the Periodic Table with the symbol 'Hn'. The nearest is hydrogen (H).
Some examples of radioactive elements on the periodic table include uranium, thorium, radium, and plutonium. These elements have unstable atomic nuclei that decay over time, emitting radiation in the process.
The periodic table cannot be said to be completed. New elements (admittedly radioactive and short-lived), are still being made.