Both metals are radioactive and members of the actinoids family.
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Several examples are uranium, thorium, radon, actinium, protactinium, plutonium, americium, etc.
Actinium has 89 protons and 89 electrons. The number of neutrons can vary between isotopes, but the most common isotope, actinium-227, has 138 neutrons.
Plutonium and uranium are both radioactive elements used in nuclear reactors. Plutonium is man-made and produced in nuclear reactors, while uranium is naturally occurring. Plutonium is more toxic and poses a greater health risk compared to uranium.
Ions with plutonium have valences between 3 and 7.
The actinides (or actinoids) family contain the following elements: actinium, thorium, protactinium, uranium, neptunium, plutonium, americium, curium, berkelium, californium, einsteinium, fermium, mendelevium, nobelium, lawrentium; beginning with neptunium the elements are only artificially obtained.