Plutonium (Pu) is a chemical element of the periodic table, located in the period 7, and has the atomic number 94. It is the sixth element in the actinide series. It is a bright, silvery-white metal that turns gray or yellow tarnish, when it is exposed to air. It is named after the planet Pluto. … Read more
Neptunium (Np) is a chemical element of the periodic table, located in the period 7, and has the atomic number 93. It is the fifth element in the actinide series. It is a silvery metal which is named after the planet Neptune. It is the first transuranium element and is counted as one of the … Read more
Uranium (U) is a chemical element of the periodic table, located in the period 7, and has the atomic number 92. It is the fourth element in the actinide series. It is a silvery-white metal which is named after the planet Uranus. It is counted as one of the radioactive elements. On periodic table group … Read more
Protactinium (Pa) is a chemical element of the periodic table, located in the period 7, and has the atomic number 91. It is the third element in the actinide series. It is a shiny, silvery-gray metal whose name comes from the Greek word “protos”, which means first. It is highly toxic and is counted as … Read more
Actinium (Ac) is a chemical element of the periodic table, located in the period 7, and has the atomic number 89. It is the first element in the actinide series. It is a soft, silvery-white metal that glows in the dark with a blue light. Its name comes from the Greek word “aktis” or “aktinos”, … Read more
Lutetium (Lu) is a chemical element of the periodic table, located in the group 3 and the period 6, and has the atomic number 71. It is the last element in the lanthanide series. It is a silvery-white metal, whose name comes from “Lutetia”, the ancient Latin name for Paris, in the Roman era. It … Read more
Ytterbium (Yb) is a chemical element of the periodic table, located in the period 6, and has the atomic number 70. It is the fourteenth element in the lanthanide series. It is a bright, soft, malleable, silvery-white metal, which is named after Ytterby, a village in Sweden, where it was mined. It is counted as … Read more
Thulium (Tm) is a chemical element of the periodic table, located in the period 6, and has the atomic number 69. It is the thirteenth element in the lanthanide series. It is a bright, silvery-gray metal, whose name comes from “Thule”, the ancient name for Scandinavia. It is not available freely in nature and is … Read more
Erbium (Er) is a chemical element of the periodic table, located in the period 6, and has the atomic number 68. It is the twelfth element in the lanthanide series. It is a soft, malleable, lustrous, silvery-white metal, which is named after Ytterby, a village in Sweden, where it was mined. It is never found … Read more
