Essentials of chemistry : inorganic and organic, for the use of students in medicine / by R.A. Witthaus.

  • Witthaus, R. A. (Rudolph August), 1846-1915.
Date:
1879, ©1878
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Licence: Public Domain Mark

Credit: Essentials of chemistry : inorganic and organic, for the use of students in medicine / by R.A. Witthaus. Source: Wellcome Collection.

Provider: This material has been provided by the Harvey Cushing/John Hay Whitney Medical Library at Yale University, through the Medical Heritage Library. The original may be consulted at the Harvey Cushing/John Hay Whitney Medical Library at Yale University.

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    ELEMENTS OF THE COPPER GROUP Copper Cu 63.5 Mercury Hg 200. 510. What is the valence of elements of this group ? They are divalent. 511. How many classes of salts do these elements form, and wherein do they differ f Two. In one class a single atom of the element acts in its divalent capacity, Cu, thus : S04Cu// ; in the other class two atoms of the element, linked together, form a group which behaves like a single divalent atom, thus : 'Cu\ \ or (Cu2) ; (Cu2)0. CD) 512. Explain the nomenclature of these compounds. Those compounds containing the single atom are designated by the termination ic, while those con- taining the double atom (Cu2) or (Hg2)// are designated by the termination ous, thus CuO is known as cupr/c oxide, and (Cu2)0 as cupr<?ws oxide; HgCl2 as mercunc chloride, and (Hg2)Cl2 as inercurtfi/s chloride. The termination ous applies to that compound containing the greater propor-