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:
| Symbol | Name | Atomic number | Description |
|---|---|---|---|
| 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.