Chemical symbol

Columns: Chemical symbol | Name | Atomic number | Origin of symbol
AcU | Actino-uranium | 92 | Name given at one time to U , an isotope of uranium | AcX | Actinium X | 88 | Name given at one time to Ra , an isotope of radium identified in the decay chain of actinium | An | Actinon | 86 | From actin ium and emanati on . Name given at one time to Rn , an isotope of radon identified in the decay chain of actinium | D | Deuterium | 1 | From the Greek deuteros . Name given to H | Io | Ionium | 90 | Name given to Th , an isotope of thorium identified in the decay chain of uranium | MsTh 1 | Mesothorium 1 | 88 | Name given at one time to Ra , an isotope of radium | MsTh 2 | Mesothorium 2 | 89 | Name given at one time to Ac , an isotope of actinium

Example questions:
What is the named isotope 's chemical symbol for the element first isolated by French chemist André-Louis Debierne in 1899 ? | What is the named isotope 's chemical symbol for the element also known as heavy hydrogen ? | Which element has a named isotope symbol derived from a number with religious and spiritual significance in many cultures ? | What is the named isotope 's chemical symbol for the sixth element in group 2 of the periodic table ?

Answers:
Ac | D | Deuterium | Ra