By T. A. H. Peacocke
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Extra resources for Atomic Theory and Structure of the Atom. Atomic and Nuclear Chemistry
The solution first turns to green chromic (oxidation state 3) and then to blue chromous (oxidation state 2). The chromous ion is highly unstable and is immediately oxidised to green chromic if any air is admitted 28 Atomic and Nuclear Chemistry to the flask. Chromous salts, with the exception of chromous acetate, must be prepared in the absence of air. Chromous acetate is sparingly soluble and can be precipitated by blowing the solution in the flask into a saturated solution of sodium acetate with the aid of carbon dioxide.
Diagonal relationships. These are particularly marked in periods 2 and 3. Thus lithium resembles magnesium in chemical properties even more than sodium. Lithium forms an almost insoluble carbonate, no solid bicarbonate is known, the fluoride is insoluble and the reaction of the metal with water is comparatively slow. Beryllium shows resemblances to aluminium. The oxide is amphoteric, the element does not decompose steam and the chloride is extremely hygroscopic. Boron shows resemblances to silicon.
E. the Avogadro number. The problem of counting α-particles was a difficult matter in 1908 since electronics was still in its infancy. Sir William Crookes had invented the spinthariscope in 1902. This beautiful little instrument consisted of a tube fitted with a lens at one end and a 47 Atoms and Electrons fluorescent zinc sulphide screen at the other. A tiny speck of radium was placed in front of the screen and little flashes were seen through the lens where the α-particles struck the screen (Fig.
Atomic Theory and Structure of the Atom. Atomic and Nuclear Chemistry by T. A. H. Peacocke