| Chemical Symbol | Name | Atomic Number | Source |
| A | ஆர்கான் | 18 | Current symbol is Ar. |
| Ab | அலாபாமைன் | 85 | Discredited claim to discovery of astatine. |
| Am | அலாபமியம் | 85 | Discredited claim to discovery of astatine. |
| An | ஆக்டினான் | 86 | Name given at one time to an isotope of radon identified in the decay chain of actinium. |
| An | Athenium | 99 | Proposed name for einsteinium. |
| Ao | Ausonium | 93 | Discredited claim to discovery of neptunium. |
| Az | Azote | 7 | Proposed name for nitrogen. |
| Bv | Brevium | 91 | Proposed name for protactinium. |
| Bz | Berzelium | 59 | Proposed name for praseodymium. |
| Cb | Columbium | 41 | Former name of niobium. |
| Cb | Columbium | 41 | Proposed name for americium. |
| Cp | Cassiopeium | 71 | Proposed name for lutetium. |
| Ct | Centurium | 100 | Proposed name for fermium. |
| Ct | Celtium | 72 | Former name of hafnium. |
| Da | Danubium | 43 | Proposed name for technetium |
| Db | Dubnium | 104 | Proposed name for rutherfordium. The symbol and name were instead used for element 105. |
| Di | Didymium | - | Rare earth metal that proved to be a mixture of the elements praseodymium and neodymium. |
| Dp | Decipium | 62 | Rare earth metal that proved to be a mixture primarily of samarium. |
| Eb | Ekaboron | 21 | Name given by Mendeleev to an as of then undiscovered element. When discovered, scandium closely matched the prediction. |
| El | Ekaaluminium | 31 | Name given by Mendeleev to an as of then undiscovered element. When discovered, gallium closely matched the prediction. |
| Em | Ekamangan | 43 | Name given by Mendeleev to an as of then undiscovered element. When discovered, technetium closely matched the prediction. |
| Es | Ekasilicon | 32 | Name given by Mendeleev to an as of then undiscovered element. When discovered, germanium closely matched the prediction. |
| Es | Esperium | 94 | Discredited claim to discovery of plutonium. |
| Fa | Francium | 87 | Current symbol is Fr. |
| Fr | Florentium | 61 | Discredited claim to discovery of promethium. |
| Gl | Glucinium | 4 | Former name of beryllium. |
| Ha | Hahnium | 105 | Proposed name for dubnium. |
| Ha | Hahnium | 108 | Proposed name for hassium. |
| Il | Illinium | 61 | Discredited claim to discovery of promethium. |
| Io | Ionium | 90 | Name given at one time to an isotope of thorium identified in the decay chain of uranium. |
| J | Iodine - நைலம் | 53 | In some languages, the name for iodine begins with J instead of I. |
| Jg | Jargonium | 72 | Discredited claim to discovery of hafnium. |
| Jo | Joliotium | 105 | Proposed name for dubnium. |
| Ku | Kurchatovium | 104 | Proposed name for rutherfordium. |
| Lw | Lawrencium | 103 | Current symbol is Lr. |
| M | Muriaticum | 9 | Former name of chlorine. |
| Ma | Masurium | 43 | Disputed claim to discovery of technetium. |
| Md | Mendelevium | 97 | Proposed name for berkelium. The symbol and name were later used for element 101. |
| Me | Mendelevium | 97 | Proposed name for erbium. The name was later used for element 101. |
| Ms | Masrium | - | Discredited claim of discovery of a new element. |
| Mt | Meitnium | 91 | Proposed name for protactinium. |
| Mv | Mendelevium | 101 | Current symbol is Md. |
| Ng | Norwegium | 72 | Discredited claim to discovery of hafnium. |
| Ni | Niton | 86 | Proposed name for radium. |
| No | Norium | 72 | Discredited claim to discovery of hafnium. |
| Ns | Nielsbohrium | 105 | Proposed name for dubnium. |
| Ns | Nielsbohrium | 107 | Proposed name for bohrium. |
| Nt | Niton | 86 | Proposed name for radium. |
| Nw | Newtonian | 67 | Proposed name for holmium. |
| Ny | Neoytterbium | 70 | Former name of ytterbium. |
| Od | Odinium | 62 | Proposed name for samarium |
| Pc | Policium | 110 | Proposed name for darmstadtium |
| Pe | Pelopium | 41 | Proposed name for niobium |
| Po | Potassium | 19 | Current symbol is K. |
| Pp | Philippium | - | Rare earth metal that proved to be a mixture of other elements. |
| Rf | Rutherfordium | 106 | Proposed name for seaborgium. The symbol and name were instead used for element 104. |
| Sa | Samarium | 62 | Current symbol is Sm. |
| So | Sodium - உவர்மம் | 11 | Current symbol is Na. |
| Sp | Spectrium | 70 | Proposed name for ytterbium. |
| St | Antimony | 51 | Current symbol is Sb. |
| Tn | Thoron | 86 | Name given at one time to an isotope of radon identified in the decay chain of thorium. |
| Tn | Tungsten | 74 | Current symbol is W. |
| Tu | Thulium | 69 | Current symbol is Tm. |
| Tu | Tungsten | 74 | Current symbol is W. |
| Ty | Tyrium | 60 | Proposed name for neodymium. |
| Unb | Unnilbium | 102 | Temporary name given to nobelium until the permanent name was chosen. |
| Une | Unnilennium | 109 | Temporary name given to meitnerium until the permanent name was chosen. |
| Unh | Unnilhexium | 106 | Temporary name given to seaborgium until the permanent name was chosen. |
| Uno | Unniloctium | 108 | Temporary name given to hassium until the permanent name was chosen. |
| Unp | Unnilpentium | 105 | Temporary name given to dubnium until the permanent name was chosen. |
| Unq | Unnilquadium | 104 | Temporary name given to rutherfordium until the permanent name was chosen. |
| Uns | Unnilseptium | 107 | Temporary name given to bohrium until the permanent name was chosen. |
| Unt | Unniltrium | 103 | Temporary name given to lawrencium until the permanent name was chosen. |
| Unu | Unnilunium | 101 | Temporary name given to mendelevium until the permanent name was chosen. |
| Uun | Ununnilium | 110 | Temporary name given to darmstadtium until the permanent name was chosen. |
| Uuu | Unununium | 111 | Temporary name given to roentgenium until the permanent name was chosen. |
| Vi | Virginium | 87 | Discredited claim to discovery of francium. |
| Vm | Virginium | 87 | Discredited claim to discovery of francium. |
| Yt | Yttrium | 39 | Current symbol is Y. |
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