Symbol (chemical Element) - Symbols Not Currently Used

Symbols Not Currently Used

The following is a list of symbols formerly used or suggested for elements, including symbols for placeholder names and names given by discredited claimants for discovery.

Chemical symbol Name Atomic number Origin of symbol Why not used
A Argon 18 Current symbol is Ar.
Ab Alabamine 85 Discredited claim to discovery of astatine.
Ad Aldebaranium 70 Former name of ytterbium.
Am Alabamium 85 Discredited claim to discovery of astatine.
An Athenium 99 Proposed name for einsteinium.
Ao Ausonium 93 Discredited claim to discovery of neptunium.
Az Azote 7 Former name for nitrogen.
Bv Brevium 91 Former name for protactinium.
Bz Berzelium 59 Suggested name for praseodymium.
Cb Columbium 41 Former name of niobium.
Cb Columbium 95 Suggested name for americium.
Cp Cassiopeium 71 Former name for lutetium.
Ct Centurium 100 Proposed name for fermium.
Ct Celtium 72 Former name of hafnium.
Da Danubium 43 Suggested name for technetium.
Db Dubnium 104 Proposed name for rutherfordium. The symbol and name were used for element 105.
E Einsteinium 99 Current symbol is Es.
Ea Ekaaluminium 31 Name given by Mendeleev to an as of then undiscovered element. When discovered, gallium closely matched the prediction.
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 Emanation 86 Also called radium emanation, the name was originally given by Friedrich Ernst Dorn in 1900. In 1923, this element officially became radon (the name given at one time to 222Rn, an isotope identified in the decay chain of radium).
Em Ekamanganese 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.
Fl Florentium 61 Discredited claim to discovery of promethium. The symbol is now used for flerovium.
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.
J Jodium 53 Old name of iodine.
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 17 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 68 Suggested name for erbium.
Ml Moldavium 87 Suggested name for francium.
Ms Masrium 49 Discredited claim of discovery of indium.
Mt Meitnium 91 Suggested name for protactinium.
Mv Mendelevium 101 Current symbol is Md.
Ng Norwegium 72 Discredited claim to discovery of hafnium.
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 Former name for radon.
Ny Neoytterbium 70 Former name of ytterbium.
Od Odinium 62 Suggested name for samarium.
Pe Pelopium 41 Former name for niobium.
Po Potassium 19 Current symbol is K. The letters were later used for polonium.
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 11 Current symbol is Na.
Sp Spectrium 70 Suggested name for ytterbium.
St Antimony 51 Current symbol is Sb.
Tn Tungsten 74 Current symbol is W.
Tu Thulium 69 Current symbol is Tm.
Tu Tungsten 74 Current symbol is W.
Ty Tyrium 60 Suggested name for neodymium.
Unb Unnilbium 102 Temporary name given to nobelium until it was permanently named by IUPAC.
Une Unnilennium 109 Temporary name given to meitnerium until it was permanently named by IUPAC.
Unh Unnilhexium 106 Temporary name given to seaborgium until it was permanently named by IUPAC.
Uno Unniloctium 108 Temporary name given to hassium until it was permanently named by IUPAC.
Unp Unnilpentium 105 Temporary name given to dubnium until it was permanently named by IUPAC.
Unq Unnilquadium 104 Temporary name given to rutherfordium until it was permanently named by IUPAC.
Uns Unnilseptium 107 Temporary name given to bohrium until it was permanently named by IUPAC.
Unt Unniltrium 103 Temporary name given to lawrencium until it was permanently named by IUPAC.
Unu Unnilunium 101 Temporary name given to mendelevium until it was permanently named by IUPAC.
Uub Ununbium 112 Temporary name given to copernicium until it was permanently named by IUPAC.
Uuh Ununhexium 116 Temporary name given to livermorium until it was permanently named by IUPAC.
Uun Ununnilium 110 Temporary name given to darmstadtium until it was permanently named by IUPAC.
Uuq Ununquadium 114 Temporary name given to flerovium until it was permanently named by IUPAC.
Uuu Unununium 111 Temporary name given to roentgenium until it was permanently named by IUPAC.
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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