Abstract
FOLLOWING Mendeléev's lead, the majority of authors on the subject since his time have represented hydrogen as belonging to the Group I elements. However, there have been some noteworthy exceptions to this representation. Thomsen1 and Bohr2 depicted hydrogen in a central position with a lineage relationship to both the alkali (Group I) and the halogen (Group VII) elements. Remy3 grouped hydrogen as the first member of the halogen series. Ramirez-Torres4 has presented a block form table with hydrogen placed in an isolated group unrelated to either the alkali or halogen elements. Thus, the placing of hydrogen has been a controversial question. In the main, this has been due to the varying properties of hydrogen.
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References
Thomsen, J., Z. Anorg. Chem., 9, 190 (1895).
Bohr, N., Naturwiss., 11, 606 (1923).
Remy, H., Treatise on Inorganic Chemistry, 1, 838 (Elsevier, 1956).
Ramirez-Torres, O., J. Chem. Educ., 32, 450 (1955).
Hylleraas, E. A., Z. Phys., 65, 209 (1930).
Dash, H. H., Nature, 198, 25 (1963).
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DASH, H. Position of Hydrogen in the Periodic System of Elements. Nature 202, 1001–1003 (1964). https://doi.org/10.1038/2021001a0
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DOI: https://doi.org/10.1038/2021001a0
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