Спереводом предложений на язык ( только без использования переводчика) 1) a discussion of sulphur would be incomplete without at least a brief consideration of these two closely related elements selenium and tellurium. 2) in the refining of ores it is essential that selenium should be removed. 3) it is metallic selenium which has unusual properties of electric conductivity. 4) it should be noted that the metallic properties of the elements of the sulphur family increase with atomic weight. 5) we are to study the element silicon. 6) both selenium and tellurium are alike in being monoanotomic at 2000̊ c. 7)silicon is located in column ii b of the periodic table following carbon. 8) the silicon atoms are characterized as being connected by oxygen atoms. 9) silicon ranks next after oxygen in abundance. 10) these differences are due to the fact that the silicon atom has a much larger radius than the carbon atom. 11) gold is not acted upon by air or oxygen at any temperature. 12) carbon fails to combine directly with chlorine.