![]() The mass number shows there is 1 particle in the nucleus and the atomic number shows that it has 1 proton. Temporary name given to roentgenium until it was permanently named by IUPAC.Hydrogen has the symbol H. Temporary name given to nihonium until it was permanently named by IUPAC. Temporary name given to tennessine until it was permanently named by IUPAC. Temporary name given to flerovium until it was permanently named by IUPAC. Temporary name given to moscovium until it was permanently named by IUPAC. Temporary name given to oganesson until it was permanently named by IUPAC. Temporary name given to darmstadtium until it was permanently named by IUPAC. Temporary name given to livermorium until it was permanently named by IUPAC. Temporary name given to copernicium until it was permanently named by IUPAC. ![]() Temporary name given to mendelevium until it was permanently named by IUPAC. Temporary name given to lawrencium until it was permanently named by IUPAC. Temporary name given to bohrium until it was permanently named by IUPAC. Temporary name given to rutherfordium until it was permanently named by IUPAC. Temporary name given to dubnium until it was permanently named by IUPAC. Temporary name given to hassium until it was permanently named by IUPAC. Temporary name given to seaborgium until it was permanently named by IUPAC. Temporary name given to meitnerium until it was permanently named by IUPAC. ![]() Temporary name given to nobelium until it was permanently named by IUPAC. The symbol and name were instead used for element 104. The symbol is now used for protactinium.Ĭurrent symbol is K. The symbol is now used for phosphorus.Ĭurrent symbol is Pd. ![]() The symbol is now used for neptunium.Ĭurrent symbol is Pb. The symbol is now used for nobelium.ĭiscredited claim to discovery of technetium. The symbol and name were later used for element 101.ĭiscredited claim to discovery of francium.ĭiscredited claim of discovery of radium.ĭiscredited claim to discovery of hafnium. The symbol is now used for iodine.ĭiscredited claim to discovery of promethium.ĭisputed claim to discovery of technetium. Current symbol is Hg.Ĭurrent symbol is Ir. Hy from the Greek hydrargyrum for "liquid silver". The symbol is now used for flerovium.ĭiscredited claim to discovery of promethium. The symbol is now used for flerovium.Ĭurrent symbol is F. The symbol is now used for einsteinium.ĭiscredited claim to discovery of promethium. The symbol is now used for einsteinium.ĭiscredited claim to discovery of plutonium. When discovered, germanium closely matched the prediction. Name given by Mendeleev to an as of then undiscovered element. In 1923, this element officially became radon (the name given at one time to 222Rn, an isotope identified in the decay chain of radium).Īlternate name formerly proposed for actinium. When discovered, technetium closely matched the prediction.Īlso called "radium emanation", the name was originally given by Friedrich Ernst Dorn in 1900. When discovered, scandium closely matched the prediction. When discovered, gallium closely matched the prediction. The symbol and name were instead used for element 105.Ĭurrent symbol is Dy. Mosander wrongly believed didymium to be an element.ĭiscredited claim to discovery of technetium. Mixture of the elements praseodymium and neodymium. The symbol is now used for copernicium.ĭiscredited claim to discovery of hafnium. The symbol is now used for chlorine.īaskerville wrongly believed carolinium to be a new element. Was actually thorium.įormer name for niobium. The symbol is now used for americium.ĭiscredited claim to discovery of neptunium.īaskerville wrongly believed berzelium to be a new element. Current symbol is Ar.ĭiscredited claim to discovery of astatine.ĭiscredited claim to discovery of astatine. Chemical symbolĪ used for Argon until 1957. The following is a list of symbols and names formerly used or suggested for elements, including symbols for placeholder names and names given by discredited claimants for discovery. List of chemical elements Antimatter atoms are denoted by a bar above the symbol for their matter counterpart, so e.g.
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