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THE IUPAC RULES The temporary names are derived systematically from the element's Atomic Number . Each digit is translated to a 'numerical root', according to the table to the right. The roots are Concatenated , and the name is completed with the ending ''-ium''. Some of the roots are Latin and others are Greek ; the reason is to avoid two digits starting with the same letter. There are two Sandhi rules designed to prevent odd-looking names.
The systematic symbol is formed by taking the first letter of each root, converting the first to a capital. All elements up to and including atomic number 111 have received permanent trivial names and symbols, so the use of systematic names and symbols is recommended only for elements 112 and above. Therefore in practice, systematic names are just those with 3-letter symbols. :''Note: These examples show conjectured elements. As Of 2006 , Ununoctium , element 118, is the highest element known.
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