PPT-Discovery of the Nucleus: Protons and Neutrons

Ernest Rutherford Determined the structure of the atom First to split the atom Hans Geiger Inventor of the Geiger counter to measure radiation Ernest Marsden Found that a few scattered alphas at angle over 140 degrees from the beam. Isotopes. Isotopes are atoms that have the same number of protons but different numbers of neutrons. Most elements in the first two rows of the periodic table have at least 2 isotopes with one being more common than the other. 1. FINAL EXAM. : Wednesday December 17, 12:30 P - 2:30 P in LR-1 VAN . FE. covers . Lectures 23 – 36. The study guide, formulas, and practice final exam questions are posted on the Exam Information Link below.. All atoms of an element have the same number of protons and the same atomic number.. Learning Goal . Given the atomic number and the mass number of an atom, state the number of protons, neutrons, and electrons.. 2. Nuclear Physics. Back to Rutherford and his discovery of the nucleus. Also coined the term “proton” in 1920, and described a “neutron” in 1921. Neutron discovered by Chadwick in 1932. Ernest Rutherford. Click to Explore . RadTown. . USA. Fundamentals of. Ionizing Radiation. The Alpha, Beta, Gammas of . Nuclear Education. . March 15. th. , 2015. Debra N Thrall, PhD. Executive Director. Radiation Fundamentals. Atoms and Isotopes. What you need to know about Atoms . and Isotopes:. Matter. Molecules. Elements. Chemical reaction. Periodic Table. The Atom. Parts of an atom. Isotopes. Unstable isotopes. Scientists and discoveries. Atoms and Isotopes. What you need to know about Atoms . and Isotopes:. Matter. Molecules. Elements. Chemical reaction. Periodic Table. The Atom. Parts of an atom. Isotopes. Unstable isotopes. Scientists and discoveries. When sedimentary rock is deposited in layers it is deposited horizontally.. Scientists use this “Principle of Original Horizontality” to help them determine the age of the layers.. The older layers of rock are found below the younger layers of rock.. Monday. What are the Atomic Numbers of these elements. Antimony. Mercury. Potassium. Chlorine. Tuesday. How many protons, neutrons, and electrons would a neutral atom of Phosphorus 31 have?. Wednesday. Examples:. Hydrogen. Carbon. Chlorine. Titanium. Atom. Democritus (450 B.C.). If . you kept cutting a substance in half forever, eventually you would end up with an “. uncuttable. ” particle. . John Dalton (1800). Tunneling. Alpha-decay, radioactivity. Thursday. :. Radioactivity. Scanning Tunneling Microscopes. PH300 . Modern . Physics SP11. “I am one of those who think like Nobel, that humanity will draw more good than evil from new discoveries.”. . . For elements of higher atomic number, the ratio rises to approximately 1.6 to 1 . As a nuclide departs from this stable ratio, changes in the nucleus occur which tend to bring the product to a more stable arrangement. . L-35 Nuclear structure. what’s inside the nucleus. what holds it together. isotopes. radioactivity. half-life. L-36 Nuclear energy. nuclear fission. nuclear fusion. nuclear reactors. nuclear weapons. What’s Inside an Atom?. An atom is made up of a team of three players:. . protons, neutrons, and electrons. . They each have a. . charge, mass, and a location. Protons + Neutrons . collectively called nucleons.