This is hard to answer.
All elements have radioactive isotopes.
Some elements have no known stable isotopes.
It might be more instructive to put the Periodic Table aside and look at a table of nuclides instead. There's a link to one in the Related Links section.
Group 3 of the periodic table contains many of the radioactive elements.
Radioactive elements exist in all groups of the periodic table.
Radioactive elements exist in all groups of the periodic table.
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.
it was found in 1896. you can not find them on the periodic table. you may find some, but often some are.
all elements after uranium (atomic number 92) are radioactive.
Radioactive atoms can be found throughout the periodic table. They can be naturally occurring elements like uranium and thorium, or they can be created synthetically in laboratories by bombarding stable atoms with particles.
Some radioactive elements in the periodic table are radium, uranium, plutonium, thorium, polonium, radon, francium, astatine, radium, and curium.
Lanthanides and Actinides probably
Radioactive substances are not exclusive to the last period of elements on the periodic table, but many of the heaviest elements, particularly those in the actinide and transactinide series, are radioactive. These elements, found at the bottom of the periodic table, typically have unstable nuclei that decay over time. However, there are also radioactive isotopes of lighter elements scattered throughout the periodic table. Thus, while many radioactive elements are at the bottom, not all radioactive substances belong to this category.
All elements comprising the period 7 in the periodic table are radioactive. In total this period has 32 elements.
You think probable to isotopes; but the most important isotope of artificial radioactive elements is included in the periodic table.