PPT-The Nucleus and Nuclear Radiation

All matter is composed of combinations of elements There are 115 elements that have been discovered so far but only 92 elements that occur in nature The smallest piece of an element that retains it characteristics is an atom. Chemistry. ________________ involve changes with electrons. . ________________ involve changes in atomic nuclei. . Spontaneously-changing nuclei emit ________ and. are said to be _________. . Chemical reactions. Review. What is . electromagnetic radiation. ?. radiation moving at the speed of light. To a certain degree the stability of a nucleus can be correlated to its . ratio of _________ to ________. Protons, neutrons. . Chemistry. How does a nuclear reactor work?. http://www.lanl.gov/science/1663/images/reactor.jpg. How does a small mass contained in this bomb cause……. Nuclear Bomb of 1945 known as . “. fat man. Nuclear physics . . what’s inside the nucleus and what . holds it together . . what is radioactivity, half-life . . carbon dating . . Nuclear energy. nuclear fission. nuclear fusion. Electrical charges. Proton. Neutron. Electron. Charge. +1. 0. -1. Mass. 1. 1. 0.0005 . (almost zero). T. he charge and mass of electrons, protons and neutrons. P2.1 Static Electricity. Protons = positively charged. Foldable Notes. Alpha Particles. 1. An . alpha particle . is a positively charged particle made up of two protons and two neutrons—the same as a helium nucleus.. 2. The . common symbol for an alpha particle is . Read pages 273-281. Radioactive Decay. Discovered in 1896 by Antoine Henri Becquerel. Inspired by discovery of X-rays, wanted to know connection between those and fluorescent or phosphorescent materials. ________________ involve changes in atomic nuclei. . Spontaneously-changing nuclei emit ________ and. are said to be _________. . Chemical reactions. Nuclear reactions. radiation. radioactive. energy and/or particles. 22.1 The Nucleus. New terms:. Nucleons- protons, neutrons and electrons. Nuclide- the atom. New symbols:. 228. 88. Ra . Superscript = atomic mass. Subscript= atomic #. Radium – 228. # is the atomic mass. Section 21.1 Types of Radioactivity. Objectives: Analyze Common Sources of Background Radiation, Compare and Contrast Alpha, Beta and Gamma Radiation, Apply the concept of Half-Life of a Radioactive Element. A person working with radioisotopes wears protective clothing and gloves and stands behind a shield.. 2. Radioactive Isotopes. A . radioactive isotope . has an unstable nucleus. emits radiation to become more stable. College of Pharmacy – . Karary. University. Department of Pharmaceutical Chemistry. Radiopharmaceuticals. . Atom structure. 1. 2. 3. What is the radius of an atom?. What is the radius of a nucleus?. 1x10. -10. m. 1x10. -15. m. Atom structure. An isotope is an element with a different number of neutrons. Isotope. We will review the practice final. . exam questions on. Monday May 4 . and Wednesday May 6.. No . c. lass. : . Friday May 8. Final Exam. : Wednesday May 13. 3 – 5 PM in LR1 VAN ( . right here! . ).