Hydrogen stands alone among the elements of the periodic system. Its single electron might make feasible its classification with the alkali metals but hydrogen does not lose its electron easily enough to warrant such classification. Similarly, hydrogen has at times been classified with the halogen elements because it needs only one more electron to satisfy the rare-gas electron arrangement of helium. In any case, trying to classify hydrogen as an alkali metal or as a halogen would only be “forcing” such a classification; for this reason, hydrogen will be considered unique among the elements, constituting a “family” in itself. Nechamkin (1968, p. 1)
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References
GARDNER, P.L. Logical connectives in science: a preliminary report.Research in Science Education, 1975,5, 161–176.
GARDNER, P.L. Logical connectives in science: some preliminary findings.Research in Science Education, 1976,6, 99–108.
GARDNER, P.L.Logical connectives in science. Report to the Education Research and Development Committee, 1977.
NECHAMKIN, H.The chemistry of the elements. New York: McGraw Hill, 1968.
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Gardner, P.L. Logical connectives in science: A summary of the findings. Research in Science Education 7, 9–24 (1977). https://doi.org/10.1007/BF02643108
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DOI: https://doi.org/10.1007/BF02643108