Question: Gregory R. Choppin, was an American nuclear chemist and co-discoverer of the element Mendelevium, atomic number 101, another in the discovery group was Glenn Theodore Seaborg, was an American chemist whose involvement in the synthesis, discovery and investigation of ten transuranium elements, earned him a share of which years Nobel Prize in Chemistry?

Context paragraphs:
Moseley's law: Moseley's law is an empirical law concerning the characteristic x-rays that are emitted by atoms.  The law was discovered and published by the English physicist Henry Moseley in 1913.  It is historically important in quantitatively justifying the conception of the nuclear model of the atom, with all, or nearly all, positive charges of the atom located in the nucleus, and associated on an integer basis with atomic number.  Until Moseley's work, "atomic number" was merely an element's place in the periodic table, and was not known to be associated with any measureable physical quantity.  Moseley was able to show that the frequencies of certain characteristic X-rays emitted from chemical elements are proportional to the square of a number which was close to the element's atomic number; a finding which supported Van den Broek and Bohr's model of the atom in which the atomic number is the same as the number of positive charges in the nucleus of the atom.  In brief, the law states that the square root of the frequency of the emitted x-ray is proportional to the atomic number.

Seaborgium: Seaborgium is a chemical element with symbol Sg and atomic number 106.  It is named after the American nuclear chemist Glenn T. Seaborg.  It is a synthetic element (an element that can be created in a laboratory but is not found in nature) and radioactive; the most stable known isotope, Sg, has a half-life of approximately 3.1 minutes.

Stanley Gerald Thompson: Stanley Gerald Thompson (1912–1976) was an American chemist.  He discovered together with Glenn T. Seaborg several of the transuranium elements.  He received a Guggenheim Fellowship (Natural Sciences - Chemistry) in 1954.

Seaborg Home (South Gate, California): The Seaborg Home was the family home of Nobel Prize–winning chemist and nuclear pioneer, Glenn T. Seaborg from 1922 to 1934.  Herman Theodore (Ted) and Selma Olivia (Erickson) Seaborg moved at Selma's urging from Ishpeming, Michigan in 1922 with their children Glenn Theodore Seaborg and Jeanette (Seaborg) Bonniksen to Home Gardens, California.  The family purchased a home on 9237 San Antonio Avenue in an area of Home Gardens, later annexed to the city of South Gate, California.  H. Thedore and Selma Seaborg lived in the home until their deaths in 1957 and 1968 respectively.

Marshall D. Gates, Jr.: Marshall D. Gates, Jr. (1915–2003) was an American chemist, holding the position of C.F. Houghton Professor of Chemistry at the University of Rochester.  He was an organic chemist whose research was in the field of natural product synthesis.  He is best known for publishing the first total synthesis of morphine in 1952.

Gregory Robert Choppin: 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.

Seaborg Technologies: Seaborg Technologies is a Danish startup company working to develop and commercialize thorium-based molten salt reactors.  Founded in 2015 and based in Copenhagen, Denmark, Seaborg Technologies emerged as a collaboration between a small team of physicists, chemists and engineers with educational roots at the Niels Bohr Institute, CERN, ESS (European Spallation Source) and DTU Center of Nuclear Technologies sharing a common vision of sustainable and cheap nuclear power.  Recently Seaborg Technologies and nuclear power (see also energy in Denmark) has seen increased media interest in Denmark, and the Danish government platform includes a statement about removing barriers to research into thorium-based technologies.  Seaborg Technologies takes it name after the American nuclear chemist and Nobel laureate Glenn T. Seaborg.

Glenn T. Seaborg: Glenn Theodore Seaborg ( ; April 19, 1912February 25, 1999) was an American chemist whose involvement in the synthesis, discovery and investigation of ten transuranium elements earned him a share of the 1951 Nobel Prize in Chemistry.  His work in this area also led to his development of the actinide concept and the arrangement of the actinide series in the periodic table of the elements.

Mendelevium: Mendelevium is a synthetic element with chemical symbol Md (formerly Mv) and atomic number 101.  A metallic radioactive transuranic element in the actinide series, it is the first element that currently cannot be produced in macroscopic quantities through neutron bombardment of lighter elements.  It is the third-to-last actinide and the ninth transuranic element.  It can only be produced in particle accelerators by bombarding lighter elements with charged particles.  A total of sixteen mendelevium isotopes are known, the most stable being Md with a half-life of 51 days; nevertheless, the shorter-lived Md (half-life 1.17 hours) is most commonly used in chemistry because it can be produced on a larger scale.

Glenn T. Seaborg bibliography: Nobel Prize–winning chemist Glenn T. Seaborg ranked among the most prolific authors in scientific history.  With some 50 books, 500 scientific journal articles, hundreds of published speeches, and a lifelong daily journal, a massive volume of written material is available in the Glenn T. Seaborg bibliography with a partial listing given below.  Seaborg frequently collaborated with other scientists, co-authors, and staff members to achieve the productivity for which he was so well known.  Although most of his writing was in the field of nuclear chemistry, history of science, science education, and science public policy, he has also collaborated on works in sports and collegiate history.

Supporting paragraphs: Gregory Robert Choppin Glenn T. Seaborg
Answer: 1951