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a metallic element called strontium

nitric acid

a radioactive isotope called ionium

a radioactive metallic element called actinium

a man-made radioactive metallic element called americium

a man-made radioactive metallic element called plutonium

a metallic element that is an artificial radioactive isotope of strontium, called strontium 90

a radioactive element called einsteinium

a radioactive transuranic metallic element

any of the monovalent metals of group I of the periodic table (lithium or sodium or potassium or rubidium or cesium or francium)

a radioactive metallic element, called uranium

an alkaline metallic element whose atomic number is 55, called cesium

a radioactive transuranic element synthesized from californium

tyrosine with one iodine atom added

a uranium isotope called actinouranium

a radioactive transuranic metallic element produced by bombarding plutonium with neutrons

an artificial radioactive element called nobelium

a radioactive halogenous element called astatine

an artificial radioactive element whose atomic number is 103, called lawrencium

an artificial radioactive element with the atomic number 98, called californium

a radioactive metallic element of atomic number 90 called thorium

an artificial radioactive element of atomic number 43 called technetium

an artificial radioactive metal element with the atomic number 93, called neptunium

a radioactive element with an atomic number of 97, called berkelium

radioactive isotope of thorium with mass number 228

a series of 15 radioactive elements with increasing atomic numbers from actinium to lawrencium

a radioactive isotope called actinon