Which family in the periodic table has elements that are all radioactive?

alkaline earth metals
actinides
halogens
nonmetals

Actinides

Explanation:

We need to Know what does it mean by elements being radioactive.

Radioactive elements  are elements whose atoms are not stable and therefore disintegrates to emit particles such as alpha, beta or gamma particles for them to attain stability.In this case, elements known as Actinides are all radioactive.Actinides are a series of radioactive elements in the group 3 of the periodic table. They include, thorium, uranium, plutonium, curium, etc.Alkaline earth metals are elements in group II of the periodic table and most of them are not radioactive. Examples include, calcium and magnesium.Halogens are group 7 elements in the periodic table. They are known to have an octet configuration. They include, Helium, neon, krypton, etc.