Lithium atomic weight

Mendeleev arranged the elements into seven groups. Lithium (atomic weight 7) was followed by beryllium (9), boron (11), carbon (12), nitrogen (14), oxygen (16), and fluorine (19). The next element in order of atomic weight was sodium (23), which had properties similar to those of lithium. Therefore, Mendeleev pinned the card for sodium under that for lithium. Six more cards were placed in the second row, ending with chlorine under fluorine. He continued in... 

Lithium Halides. Lithium haHde stabiHty decreases with increasing atomic weight of the halogen atom. Hence, the solubiHty increases from the sparingly soluble Hthium fluoride to the very soluble bromide and iodide salts. The low melting points of Hthium haHdes are advantageous for fluxes in many appHcations. 

See also p. 18 for the influence on the atomic weight of commercially available lithium in some countries. 

Historians differ regarding the precise assignment of elements to these values. In particular they disagree with respect to the identity of the element depicted as 7 or 14. According to some it is twice the atomic weight of lithium, while others maintain that it is beryllium using an older value for its atomic weight. 

Since there is no metal with an atomic weight of 14.0 g/mol (nitrogen is not a metal), then the metal Q must be lithium, a IA element with an atomic weight of 6.9 g/mol), and the compound must be Li2C03. 

For lithium, as for a few other elements (noble gases), modified isotopic compositions may be found in commercially available material because it has been subject to undisclosed isotopic fractionation commercially available lithium specimens have atomic weights that range between 6.939 and 6.996 if a more accurate value is needed it must be determined for the specific material. 

Aston EW (1932) The isotopic constitution and atomic weights of cesium, strontium, lithium, rubidium, barium, scandium and thallium. Proc Roy Soc A 134 571 Bach RO (ed) (1985) Lithium—Current Applications in Science, Medicine, and Technology. Wiley-Interscience, New York... 

Dissertation, Universitat Gottingen, Gottingen, Germany Collins AG (1976) Lithium abundances in oilfield waters. Itr. Lithium Resources and Requirements by the Year 2000. Vine JD (ed) U.S. Geol Surv Prof Pap 1005 116-123 Coplen TB (1996) Atomic weights of the elements 1995. Pure Appl Chem 68 2339-2359... 

Lamberty A, Michiels E, DeBievre P (1987) On the atomic weight of lithium. Int J Mass Sped Ion Proc 79 311-313... 

A remarkable property of the atomic weights was discovered, in the sixties, independently by Lothar Meyer and Mendeleeff. They found that the elements could be arranged in rows in the order of their atomic weights so that similar elements would be found in the same columns. A modernised form of the Periodic Table will be found on pp. 106, 107. It will be noticed, for example, that the "alkali" metals, Lithium, Sodium, Rubidium and Caesium, which... 

Newland s law of octaves chem An arrangement of the elements that predated Mendeleev s periodic table Newland s arrangement was a grouping of the elements in increasing atomic weights (starting with lithium) In horizontal rows of eight elements, with each new row directly beneath the previous one. nti-lonz 16 3v ak-tivz ... 

ISOTOPES There are two stable lithium isotopes Li-6.015, which makes up 7.5% of all lithium atoms, and Li-7.016, which makes up 92.5% of lithium atoms found in the Earth s crust. Less prevalent isotopes of lithium are Li, Li-5, Li-8, Li-9, Li-10, and Li-11. They are unstable with short half-lives and make up only a very small fraction of Lithium s total averaged atomic weight. 

I have been very fortunate with my new metal. I have fifty grams of the almost pure chlorplatinate, which I can easily make absolutely pure. To be sure these fifty grams were obtained from 600 hundred weights (quintals) of mineral water, whereby 2 Vs pounds of lithium chloride were obtained as a by-product. Since I have a simple method of separating it, I find it widely distributed. I shall name it cesium because of its beautiful blue spectral hne. Next Sunday I expect to find time to make the first determination of its atomic weight. 

The elements have remarkably low specific gravity, and a high atomic volume (q.v.). The oxides and hydroxides are markedly basic they do not exhibit acidic qualities. The physical properties of the salts—solubility in water, molecular volume, optical properties, and the variation in the form of the crystals show the same order of variation as the atomic weights of the elements. Lithium differs in mafiy respects from the other members of the family. The salts of the alkali metals —nitrates, chlorides, sulphides, sulphates, phosphates, carbonates, etc.—are nearly all soluble in water, although lithium, carbonate, phosphate, and fluoride are very... 

Like others before him, Mendeleyev noticed a repeating pattern among the 63 known elements when they were listed in order of atomic weight. The pattern was periodic, meaning that the pattern repeated itself after a certain number of elements. In Mendeleyev s first periodic table, the pattern repeated with every seventh element, with the exception of the first element hydrogen. For instance, lithium was similar to sodium, which appeared seven elements after it in the table. Potassium, which was similar to sodium and lithium, appeared seven elements after sodium. In todays periodic table, lithium, sodium and potassium sit on top of each other in a column. Mendeleyev first arranged the table so that these similar elements would form a horizontal line, but later turned the table so that it looked more like the modern... 

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