Actinium is a chemical element with the symbol Ac and atomic number 89. It was discovered in 1899 by French chemist André-Louis Debierne in pitchblende residues left after French physicists Pierre and Marie… Read More »Actinium Chemical Element
Francium is a chemical element with the symbol Fr and atomic number 87. It is extremely radioactive; its most stable isotope, francium-223 has a half-life of only 22 minutes. It is the second-most… Read More »Francium Chemical Element Properties
Thorium is a chemical element with the symbol Th and atomic number 90. In its pure form, it is a silvery-white metal that is stable in air and remains lustrous for several… Read More »Thorium Chemical Properties
Plutonium is a radioactive chemical element with the symbol Pu and atomic number 94. It is an actinide metal of silvery-gray appearance that tarnishes when exposed to air and forms a dull coating when… Read More »Plutonium Element Properties
Curium is a hard metal having an atomic number of 96 and symbol Cm. This metal is artificially produced in the nuclear reactors. It is… Read More »Curium Element Properties
Protactinium is a chemical element with the symbol Pa and atomic number 91. It is a dense, silvery-gray actinide metal that readily reacts with oxygen, water vapor, and inorganic acids. It forms… Read More »Protactinium Element Properties
Neptunium is a chemical element with the symbol Np and atomic number 93. It is a radioactive actinide metal, neptunium is the first transuranic element. Its position in the periodic table just after uranium, named after the planet Uranus, led to… Read More »Neptunium Chemical Element Properties
Americium is a human-made actinide element with the symbol Am and atomic number 95. It is a transuranic member of the actinide series, in the periodic table located under the lanthanide… Read More »Americium Chemical Element Properties
Californium is a radioactive chemical element with the symbol Cf and atomic number 98. The element was first synthesized in 1950 at the Lawrence Berkeley National Laboratory (then the University of California Radiation Laboratory), by bombarding curium with alpha… Read More »Californium Chemical Properties
Berkelium is a transuranic radioactive chemical element with the symbol Bk and atomic number 97. Not occurring in nature, It was discovered in December 1949 by American chemists Stanley G. Thompson, Albert Ghiorso, and Glenn T.… Read More »Berkelium Element Properties