Osmium tetroxide (OsO{4}) is a very volatile liquid and is used under the name of osmic acid as a stain for sections in microscopy.
Iridium and Osmiumdiscovered by Tenant, and Cerium by Berzelius.
Defn: Denoting those compounds of osmium in which the element has a valence relatively lower than in the osmic compounds; as, osmious chloride.
Defn: A rare sulphide of osmium and ruthenium found with platinum in Borneo and Oregon.
Defn: An oxide having four atoms of oxygen in the molecule; a quadroxide; as, osmium tetroxide, OsO.
Valence in degree may extend as high as seven or eight, as in the cases of iodine and osmium respectively.
Note: Iridium usually occurs as a native alloy with osmium (iridosmine or osmiridium), which may occur alone or with platinum.
In the case of the tantalum lamp the exponent x has a value near to 6, but the exponent y is a number near to 4, and the same for the osmium filament.
Owing to its extreme brittleness, osmium was finely divided and made into a paste of organic material.
The osmium filament appeared in 1905 and its invention is due to Welsbach, who had produced the marvelous gas-mantle.
The tantalum filament was quickly followed by osmium and by tungsten in this country.
The native alloy of osmium and iridium does not alloy with gold, however, but falls to the bottom of the molten metal.
The gold may contain an alloy of osmium and iridium; if so, it should be weighed and treated with aqua regia.
Palladium is distinguished by the insolubility of its iodide; and Osmium by the volatility of its oxide on boiling with nitric acid.
For standardizing the osmium lamp, an amylacetate lamp, is provided with a stand for holding the optical tube.
The principle on which this instrument is constructed is that of comparing the quantity of light emanating from the heated body with a constant source of light, in this case a two-volt osmium lamp.
The metals platinum, iridium, rhodium, osmiumand palladium do not fuse.
The ore ofosmium and iridium can be decomposed, and the former recognized by its fetid odor.
A rare sulphide of osmiumand ruthenium found with platinum in Borneo and Oregon.
The specific gravity of osmium in the pulverulent form is about 10; but after having been heated to the fusing point of rhodium in the oxyhydrogen jet, it acquires a density of 21.
In Fremy's process for separating osmium from the residues of platinum ore, ruthenium occurs in a dioxide.
It is also formed when metallic osmium is heated with potassic nitrate, or roasted in air.
The mercurous oxide which is first formed at the expense of the oxygen contained in the tetroxide of osmium is decomposed by the hydrochloric acid, and calomel is produced, together with metallic osmium.
To separate the osmiumfrom the other metals, Fremy takes advantage of its easy oxidability, and of the volatility of its tetroxide.
There are several processes for obtaining osmium in the metallic condition.
The water and excess of acid are removed by evaporation to dryness, and on heating the residue in a small porcelain retort, the excess of mercury and calomel is drawn off, pure osmium being left behind in the form of a fine powder.
Its bluish-black hydrate, which dissolves in hydrochloric acid, forms a solution of osmium dichloride of a deep indigo blue colour.
It may be obtained by heating metallic osmium in a current of dry chlorine gas.
Osmium appears to be the least fusible of all the metals.
Both the dry chloride and the tetrachloride of osmium are dissolved by water, which decomposes them into tetroxide of osmium, hydrochloric acid and the metal.
Otherwise, how would he have guessed that the stuff in the sampling chamber was Osmium 187?
Now invent an electro-magnetic vibration--by useing the metal Osmium B--exactly the length of a Copper atom.
In that state of combination, as shewn in the table, the iridium and osmium are found combined in crystals, sometimes to the amount of 0.
Osmium is the most difficult to fuse: indeed, I believe it never has been fused, while every other metal has.
So with iridium and rhodium, and osmium and ruthenium, which are so closely allied that they make pairs, being separated each from its own group.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "osmium" in a variety of sentences. We hope that you will now be able to make sentences using this word.
