![]() The new IUPAC scheme was developed to replace both systems as they confusingly used the same names to mean different things. The former system was frequently used in Europe while the latter was most common in America. Assuming a ton is 2,000 lbs use the following equation to figure out how many grams of gold by mass there is: NOTE if this is a metric ton then the conversion will be 1 metric ton 1000 kg. ![]() In the old IUPAC system the letters A and B were designated to the left (A) and right (B) part of the table, while in the CAS system the letters A and B were designated to main group elements (A) and transition elements (B). There is considerable confusion surrounding the two old systems in use (old IUPAC and CAS) that combined the use of Roman numerals with letters. The Roman numeral names are the original traditional names of the groups the Arabic numeral names are those recommended by the International Union of Pure and Applied Chemistry (IUPAC) to replace the old names in an attempt to reduce the confusion generated by the two older, but mutually confusing, schemes. Boron (pronunciation BO-ron), represented by the chemical symbol or chemical formula B, is hard and brittle in its crystalline form. ![]() There are three ways of numbering the groups of the periodic table, one using Hindu-Arabic numerals and the other two using Roman numerals. The modern explanation of the pattern of the periodic table is that the elements in a group have similar configurations of the outermost electron shells of their atoms: as most chemical properties are dominated by the orbital location of the outermost electron.
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