Berkelium(IV) fluoride (BkF4) is a yellow-green ionic solid which crystallizes in the monoclinic crystal system (Pearson symbol mS60, space group C2/c No. 15, lattice constants a = 1247 pm, b = 1058 pm, c = 817 pm) and is isotypic with uranium tetrafluoride or zirconium(IV) fluoride. (wikipedia.org)
A lustrous , silvery gray, tetravalent transition metal , hafnium chemically resembles zirconium and is found in many zirconium minerals . (wikiwand.com)
Form2
Berkelium can also form several organometallic compounds. (wikipedia.org)
It is nonmetallic and tetravalent-making four electrons available to form covalent chemical bonds. (periodic-table.org)
Chemical1
Berkelium forms a number of chemical compounds, where it normally exists in an oxidation state of +3 or +4, and behaves similarly to its lanthanide analogue, terbium. (wikipedia.org)
Terbium1
Berkelium forms a number of chemical compounds, where it normally exists in an oxidation state of +3 or +4, and behaves similarly to its lanthanide analogue, terbium. (wikipedia.org)
Chloride6
The existence of divalent berkelium salts is uncertain and has only been reported in mixed lanthanum chloride-strontium chloride melts. (wikipedia.org)
The coordination of the berkelium atom in its trivalent fluoride and chloride is tricapped trigonal prismatic, with a coordination number of 9. (wikipedia.org)
Visible amounts of berkelium(III) chloride (BkCl3) were first isolated and characterized in 1962, and weighed only 3 billionths of a gram. (wikipedia.org)
It can be prepared by introducing hydrogen chloride vapors into an evacuated quartz tube containing berkelium oxide at a temperature of about 500 °C. This green solid has a melting point of 603 °C and crystallizes in the hexagonal crystal system isotypic with uranium(III) chloride (Pearson symbol hP8, space group P63/m, No. 176). (wikipedia.org)
Another berkelium(III) chloride, Cs2NaBkCl6 can be crystallized from a chilled aqueous solution containing berkelium(III) hydroxide, hydrochloric acid and caesium chloride. (wikipedia.org)
The ternary berkelium(IV) chloride Cs2BkCl6 is obtained by dissolving berkelium(IV) hydroxide in a chilled solution of caesium chloride in concentrated hydrochloric acid. (wikipedia.org)
Oxidation3
Like all actinides, berkelium easily dissolves in various aqueous inorganic acids, liberating gaseous hydrogen and converting into the trivalent oxidation state. (wikipedia.org)
The former name Actinide does not correspond to the proposal of the Nomenclature Commission, since after this the ending "-id" for binary compounds such as z. (zxc.wiki)
Amounts1
Gallium does not occur as a free element in nature, but as gallium(III) compounds in trace amounts in zinc ores and in bauxite. (jaromirstetina.cz)
Uranium1
Berkelium(IV) fluoride (BkF4) is a yellow-green ionic solid which crystallizes in the monoclinic crystal system (Pearson symbol mS60, space group C2/c No. 15, lattice constants a = 1247 pm, b = 1058 pm, c = 817 pm) and is isotypic with uranium tetrafluoride or zirconium(IV) fluoride. (wikipedia.org)