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Salts of H,CrO, with those of
H.Mno, and H,Te0 Cr,03 with Al2O3, M110, and Feug Mn,03 with AlO3, Cr,0, and
Fe,, RMn0, with R. Cro
Cr,Öz. Mn,O, and derivatives,
compounds with those of Fe
Ni and Co, some with Fe (ser.
As compounds with those of Sb
indirectly : doubtful
compounds of Sr, Ca, and Ba]
Sr compounds with those of Ca and Ba, and with some Pb salts
sp. heats of a few compounds de. Yt compounds with those of other termined
earth metals directly [? too low]
Zr0, with Tio, Tho,, SnO, and
SiŐ, Nb with Ta compounds, Nb fluorides and oxyfluorides with Mo
do. do. directly [? too high)
Mo with W compounds, some salts of H M00, with those of H.CrO,, Mo with Nb fluorides and oxyHuorides
55 9 (see p. 56)
20 Chromium chloride, silver
chromate, potassium dichro21 Manganese chloride, mangan.
ous-manganic oxide, manganous oxalate, silver per
manganate, &c. 22 Synthesis of ferric oxide,
reduction of ferric oxide, analysis of ferrous and ferric
chlorides 23 Nickel chloride, nickelous ox
brucine-nickel cyanide, &c. 44 Ammonium . cobalt cyanide,
phenyl-ammonium cobalt cy: anide, strychnine and bru.
cine-cobalt cyanides 25 Reduction of copper oxide,
electrolysis of copper sul
phate, &c. 25 Synthesis of zinc oxide, analy.
sis of potassium-zinc chloride 27 Oxidation of the metal, analy.
sis of gallium-ammonia alum 28 Arsenic bromide, do. chloride,
69 (see p. 56)
Rb. From analogies between Rb(and its salts) and the metals of the al. kalis, the formulæ RbCI, Rb,O, &c. are most probably correct : if so, the atomic weight of Rb is to be taken as equal to its combining weight. Sr. The atomic weight of strontium
must be taken as 4365 X 2 = 87'3 if the formula of its salts are to become analogous to those of the Ba and Ca salts. Yt. Atomic weight probably = 29*87 x3 = 89'6 because of analogy of Yt salts with those of earth metals.
chloride and pentachloride
most Ru compounds with those of
Rh, Pd, Ir, Pt and Os PALLADIUM
most Pd compounds with those of
Ru, Rh, Ir, Pt and Os SILVER none directly
some Ag compounds with those of Na and other alkali metals, Ag with Cu compounds of type R,O, a few Ag and Au com
pounds CADMIUM CABr
some Cd compounds with those of
Be and Zn INDIUM InCl,
some In compounds with those of
Cd and Be
SnO, with TiO2, Zr0, and Tho, ANTIMONY ShH3, SbCl3, SbF3, directly
Sb compounds with those of As Sb(CH3)2
and Bi IODINE IH, ICI, I(CH2', 1.P, directly
Iodides with analogous 1,Hg, 13P, 1,As, I.Si,
pounds of Cland Br* 1.AZ, &c. TELLURIUM Tella
most Te compounds with those
of S and Se CÆSIUM
Cs compounds with those of other (comparison of specific heats of metals of alkalis
compounds with those of other
alkali metals] BARIUM none indirectly: doubtful
Ba compounds with those of Ca (comparison of specific heats of and Sr
compounds of Ca, Sr, and Ba) LANTHANUM none
most La compounds with those of DIDYMIUM
Ce, Di, Er and Yt, some comnone directly
pounds of these metals with Ca ERBIUM
sp. heats of a few compounds
sp, heats of a few compounds (? a few Yb compounds with those determined
of other earth metals) TANTALUM TaCl,
Ta with Nb compounds TUNGSTEN WOCIĄ, WCI,, WCIA directly
W with Mo compounds, some salts of H.WO, with those of
H.Cro, and H, Tel. IRIDIUM
directly OSMIUM OSO,
Os, Ir and Pt compounds with
those of Ru, Rh and Pd PLATINUM none
Er. This metal belongs to the earth group, hence the atomic weight is taken as 55:33 X 3 = 166. Yb. For similar reasons to those which apply in cases of Sc, Yt and Er, the atomic weight of Viterbium is supposed to be 3 times its combining weight (= 173).
54 Potassium - tantalum fluoride,
ammonium-tantalum fluoride 53 Reduction of tungstic oxide,
analysis of tungsten hexclor
ide 54 Potassium iridium chloride
57 Osmium tetroxide
48.13 48 25 48.575
58 Potassium-platinum chloride
(s. The number given is calculated from 2 determinations of vapour density of Os(), by Deville and Debray, other experimenters have found numbers for atomic weight of this metal varying from 195 to 197.
Notes to Table of Atomic Weights.
B. This column (vi.) is not to be regarded as containing anything like a
A complete account of all researches on this subject will be found in A Ricalculation of the Alomic Weights, by F. W. Clarke [Part v. of the Constants of Nature published by the Smithsonian Institution), and also in Die Atomgewichte der Elemente, by L. Meyer and K. Seubert [Leipzig, 1883].
C. When the atomic weight given in column V. section (2) is a multiple of the combining number in column vii., no number being given in section (1) of column V., it is to be inferred that, besides the argument drawn from the value of the specific heat of the element in question, there are other chemical reasons for adopting the special multiple which appears in v. (2): these reasons may be broadly described as based on analogies between salts of the given element and salts of other elements, the atomic weights of which have been established by the two leading physical methods.