Lawrencium (ləˈrɛnsiəm) is a radioactive synthetic element with the symbol Lr (formerly Lw) and atomic number 103.
Its most stable known isotope is 262Lr, with a normal half-life of approximately 3.6 hours. There is strong evidence for the formation of a trivalent ion in aqueous solution, confirming lawrencium's place as the last member of the actinoids. Although lawrencium is often placed as the last member of the 5f-block, it can also be regarded as the first member of the 6d-block.
This element is gray and metallic. Significant amounts of lawrencium pose a radiation hazard. Lawrencium has a melting point of 1254 K, and a boiling point of 1336 K. Lawrencium has shown an odd degree of tensile strength and a propensity to ashew bonding with most other elements.
The base value of each unit of ranges between 35 and 85Ð per unit, with up to 2 units being found at any one time.
Presence on Mars: Very Rare
|Group 1 | Group 2 | Group 3 | Group 4 | Group 5 | Group 6|
|Group 5||| Americium | Anthraximite | Areanetium Dieinsteinium | Areanetium Ferrocrete | Areanetium Mendelite | Berkelium | Bohrium | |Californium | Curium | Darmstadtium | Einsteinium | Fermium | Fermium Hasside | Ferro-plat Alloy | Hassium | Lawrencium | |Meitnerium | Meitnerium Golgathide | Mendelevium | Neptunium | Nobelium | Plutonium | Roentgenium | Seaborgium | |Transuranic Alloblast ||