Question: Who is this Danish physicist who made contributions to understanding atomic structure and quantum theory after whom a synthetic radioactive element with a half-life of about a minute is named?

Context paragraphs:
Roentgenium: Roentgenium is an extremely radioactive chemical element with symbol Rg and atomic number 111.  It is a synthetic element that can be created in a laboratory but is not found in nature.  The most stable known isotope, roentgenium-282, has a half-life of 2.1 minutes, although the unconfirmed roentgenium-286 may have a longer half-life of about 11 minutes.  Roentgenium was first created in 1994 by the GSI Helmholtz Centre for Heavy Ion Research near Darmstadt, Germany.  It is named after the physicist Wilhelm Röntgen (also spelled Roentgen).

List of things named after Niels Bohr: Niels Bohr (1885 – 1962), Danish physicist who made foundational contributions to understanding atomic structure and quantum theory, is the eponym of the topics listed below.

Bohrium: Bohrium is a chemical element with symbol Bh and atomic number 107.  It is named after Danish physicist Niels Bohr.  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, Bh, has a half-life of approximately 61 seconds, though the unconfirmed Bh may have a longer half-life of about 690 seconds.

Meitnerium: Meitnerium is a chemical element with symbol Mt and atomic number 109.  It is an extremely radioactive synthetic element (an element not found in nature that can be created in a laboratory).  The most stable known isotope, meitnerium-278, has a half-life of 7.6 seconds, although the unconfirmed meitnerium-282 may have a longer half-life of 67 seconds.  The GSI Helmholtz Centre for Heavy Ion Research near Darmstadt, Germany, first created this element in 1982.  It is named for Lise Meitner.

Nobelium: Nobelium is a synthetic chemical element with symbol No and atomic number 102.  It is named in honor of Alfred Nobel, the inventor of dynamite and benefactor of science.  A radioactive metal, it is the tenth transuranic element and is the penultimate member of the actinide series.  Like all elements with atomic number over 100, nobelium can only be produced in particle accelerators by bombarding lighter elements with charged particles.  A total of twelve nobelium isotopes are known to exist; the most stable is No with a half-life of 58 minutes, but the shorter-lived No (half-life 3.1 minutes) is most commonly used in chemistry because it can be produced on a larger scale.

Period 1 element: A period 1 element is one of the chemical elements in the first row (or period) of the periodic table of the chemical elements.  The periodic table is laid out in rows to illustrate periodic (recurring) trends in the chemical behaviour of the elements as their atomic number increases: a new row is begun when chemical behaviour begins to repeat, meaning that elements with similar behaviour fall into the same vertical columns.  The first period contains fewer elements than any other row in the table, with only two: hydrogen and helium.  This situation can be explained by modern theories of atomic structure.  In a quantum mechanical description of atomic structure, this period corresponds to the filling of the 1s orbital.  Period 1 elements obey the duet rule in that they need two electrons to complete their valence shell.  The maximum number of electrons that these elements can accommodate is two, both in the 1s orbital.  Therefore, period 1 can have only two elements.

Niels Bohr: Niels Henrik David Bohr (] ; 7 October 1885 – 18 November 1962) was a Danish physicist who made foundational contributions to understanding atomic structure and quantum theory, for which he received the Nobel Prize in Physics in 1922.  Bohr was also a philosopher and a promoter of scientific research.

Livermorium: Livermorium is a synthetic superheavy element with symbol Lv and atomic number 116.  It is an extremely radioactive element that has only been created in the laboratory and has not been observed in nature.  The element is named after the Lawrence Livermore National Laboratory in the United States, which collaborated with the Joint Institute for Nuclear Research in Dubna, Russia to discover livermorium in 2000.  The name of the laboratory refers to the city of Livermore, California where it is located, which in turn was named after the rancher and landowner Robert Livermore.  The name was adopted by IUPAC on May 30, 2012.  Four isotopes of livermorium are known, with mass numbers between 290 and 293 inclusive; the longest-lived among them is livermorium-293 with a half-life of about 60 milliseconds.  A fifth isotope with mass number 294 has been reported but not yet confirmed.

Lawrence Paul Horwitz: Lawrence Paul Horwitz (born October 14, 1930) is an American/Israeli physicist and mathematician who has made contributions in particle physics, statistical mechanics, mathematical physics, theory of unstable systems, classical chaos and quantum chaos, relativistic quantum mechanics, quantum field theory, general relativity, representations of quantum theory on hypercomplex Hilbert modules, group theory and functional analysis and stochastic theories of irreversible quantum evolution.

Lawrencium: Lawrencium is a synthetic chemical element with symbol Lr (formerly Lw) and atomic number 103.  It is named in honor of Ernest Lawrence, inventor of the cyclotron, a device that was used to discover many artificial radioactive elements.  A radioactive metal, lawrencium is the eleventh transuranic element and is also the final member of the actinide series.  Like all elements with atomic number over 100, lawrencium can only be produced in particle accelerators by bombarding lighter elements with charged particles.  Twelve isotopes of lawrencium are currently known; the most stable is Lr with a half-life of 11 hours, but the shorter-lived Lr (half-life 2.7 minutes) is most commonly used in chemistry because it can be produced on a larger scale.

Supporting paragraphs: Bohrium Niels Bohr
Answer: Niels Bohr