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The lanthanite crystal ... groups connected by hydrogen bonds to interlayer water molecules, ... Lanthanites are frequently found as secondary minerals formed by the ...
Lanthanide metals react exothermically with hydrogen to form LnH 2, dihydrides. [1] With the exception of Eu and Yb, which resemble the Ba and Ca hydrides (non-conducting, transparent salt-like compounds),they form black pyrophoric, conducting compounds [6] where the metal sub-lattice is face centred cubic and the H atoms occupy tetrahedral sites. [1]
Lanthanide metals react exothermically with hydrogen to form LnH 2, dihydrides. [24] With the exception of Eu and Yb, which resemble the Ba and Ca hydrides (non-conducting, transparent salt-like compounds), they form black, pyrophoric , conducting compounds [ 48 ] where the metal sub-lattice is face centred cubic and the H atoms occupy ...
When it reacts with water, lanthanum hydroxide is formed: [37] a lot of heat is evolved in the reaction and a hissing sound is heard. Lanthanum hydroxide will react with atmospheric carbon dioxide to form the basic carbonate. [38] Lanthanum fluoride is insoluble in water and can be used as a qualitative test for the presence of La 3+.
Praseodymium(IV) oxide can be produced by boiling Pr 6 O 11 in water or acetic acid: [16] Pr 6 O 11 + 3 H 2 O → 4 PrO 2 + 2 Pr(OH) 3. Praseodymium(III,IV) oxide is the most stable form of the praseodymium oxides at ambient temperature and pressure. [17] It is soluble in water [18] and has a cubic fluorite structure. [19]
The angle θ gives the angle of tilt of the water molecules relative to a plane in the aqua ion. This angle is affected by the hydrogen bonds formed between water molecules in the primary and secondary solvation shells. The measured solvation number is a time-averaged value for the solution as a whole.
Lanthanum oxide is a white solid that is insoluble in water, but dissolves in acidic solutions. La 2 O 3 absorbs moisture from air, converting to lanthanum hydroxide. [2] Lanthanum oxide has p-type semiconducting properties and a band gap of approximately 5.8 eV. [3]
Lutetium compounds are compounds formed by the lanthanide metal lutetium (Lu). In these compounds, lutetium generally exhibits the +3 oxidation state, such as LuCl 3, Lu 2 O 3 and Lu 2 (SO 4) 3. [1] Aqueous solutions of most lutetium salts are colorless and form white crystalline solids upon drying, with the common exception of the iodide.