Question: What famous nuclear scientist died on December 26, 2010 and was on the team that discovered the element Mendelevium?
Context: Ratan Kumar Sinha widely known by R. K. Sinha is an Indian nuclear scientist and mechanical engineer.  He had served as the Secretary to the Government of India, Department of Atomic Energy (DAE) and Chairman of the Atomic Energy Commission (AEC), Government of India from April 2012 to October 2015.  Prior to that, Ratan Kumar Sinha had served as Director of Bhabha Atomic Research Centre (BARC), Mumbai from May 2010 to June 2012.  During his four decades of illustrious career, Ratan Kumar Sinha held several important positions related to design & development of nuclear reactors for the Indian nuclear programme.  He has been actively involved in the development of Advanced Heavy Water Reactor (AHWR) and Compact High Temperature Reactor (CHTR), two of the highly acknowledged technological innovations which are suitable for large scale deployment of nuclear power, particularly in Indian scenario. Homi Nusserwanji Sethna PhD (24 August 1923 – 5 September 2010) was an Indian nuclear scientist and a chemical engineer, gaining international fame as the Chairman of the Atomic Energy Commission (India) during the time when the first nuclear test, codename "Smiling Buddha" in Pokhran Test Range in 1974 was conducted.  He was the primary and central figure in India's civilian nuclear program as well as the construction of nuclear power plants. Chaitanyamoy Ganguly is an Indian nuclear scientist and a former Head of the "Nuclear Fuel Cycle and Materials Section" of the International Atomic Energy Agency (IAEA), credited with many innovations in the field of nuclear material science.  He was honored by the Government of India, in 2002, with the fourth highest Indian civilian award of Padma Shri. Sekhar Basu is a nuclear scientist and is currently the Chairman, Atomic Energy Commission and Secretary to the Government of India, Department of Atomic Energy (DAE).  Prior to his assumption of charge as Secretary, DAE, he has served as the Director of Bhabha Atomic Research Centre (BARC), India’s premier multi-disciplinary R&D centre.  He has also worked as the Project Director of Nuclear Submarine Programme and later as the Chief Executive of the Nuclear Recycle Board in the same institute.  Sekhar Basu has played major role in establishing India as a lead country in various domains of nuclear sciences and engineering. Viktor Nikitovich Mikhaylov (Russian: Виктор Никитович Михайлов 12 February 1934 in Moscow - 25 June 2011) was a Russian academic and nuclear scientist.  From 1969 to 1988 Mikhaylov directed the research institute on nuclear impulse technology.  He personally oversaw more than 100 nuclear experiments during his directorship. Albert Ghiorso (July 15, 1915 – December 26, 2010) was an American nuclear scientist and co-discoverer of a record 12 chemical elements on the periodic table.  His research career spanned five decades, from the early 1940s to the late 1990s. Jyeshtharaj Bhalchandra Joshi is an Indian chemical engineer, nuclear scientist, consultant and teacher, widely known for his innovations in nuclear reactor designs and generally regarded as a respected teacher.  He is the DAE-Homi Bhabha Chair Professor, Homi Bhabha National Institute, Mumbai, and is the recipient of Shantiswarup Bhatnagar Prize for Engineering Sciences and many other awards and recognitions.  He received the third highest civilian honour, the Padma Bhushan, in 2014, from the President of India, for his services to the field of chemical engineering and nuclear science. Gregory R. Choppin (November 9, 1927, Texas, United States – October 21, 2015, Tallahassee, Florida) was an American nuclear chemist and co-discoverer of the element Mendelevium, atomic number 101 Others in the discovery group were Albert Ghiorso, Bernard G. Harvey, Stanley G. Thompson, and Glenn T. Seaborg.  The element was named in honor of Dmitri Mendeleev. Percival Albert Frederick White OBE (16 July 1916 – 8 January 2013) was a British chemist, metallurgist and nuclear scientist who was involved in the creation and testing of Britain's first nuclear weapon during Operation Hurricane in 1952.  He also made significant contributions to the advancement of explosives manufacturing, chemical engineering and civilian nuclear technology, and authored numerous books on engineering. Samuel Untermyer II, (25 November 1912 – 26 January 2001) was a United States nuclear scientist who theorized that steam bubble formation in a nuclear reactor core would not produce unstable reactions, but would instead result in an inherently stable and self-controlling reactor design.  This was eventually proved in the BORAX experiments, which led to the design of the Boiling water reactor.  In recognition of his fundamental development work on water-cooled reactors, the American Nuclear Society now has an award named after him for work in this field.
Answer: Albert Ghiorso