Any asterisks (*) showing? These symbols are not accepted by the IUPAC standard.
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This converter uses symbols from 118 chemical elements: Hydrogen (Z=1) through Oganesson (Z=118). It does not include the 3-letter temporary symbols used for hypothetical elements. The coding for this converter is set up in a way that, wherever possible, one 2-letter symbol is used for two consecutive letters. If a 2-letter symbol is not possible, 1-letter symbols are used.
This system fails for the following single letters: A, D, E, G, J, L, M, Q, R, T, X and Z; because they are not IUPAC accepted 1-letter symbols for chemical elements. To get around this, the following deprecated 'symbols' were manually added to the database:
|A||Argon||18||Used for Argon until 1957. Current symbol is Ar.|
|D||Didymium||59/60||Mixture of the elements Praseodymium and Neodymium. Mosander wrongly believed Didymium to be an element.|
|E||Einsteinium||99||Current symbol is Es.|
|G||Glucinium||4||Former name for Beryllium.|
|J||Jodium||53||Former name for Iodine.|
|L||Lithium||3||Current symbol is Li.|
|M||Muriaticum||17||Former name for Chlorine.|
|R||Rhodium||45||Current symbol is Rh.|
|X||Xenon||54||Current symbol is Xe.|
Note that the symbols from this table, in addition to the 'element-less' symbols Q, T and Z, all show an asterisk (*) in the upper right corner of their tile.