BIOL 2050 1nd Edition Lecture 2 Outline of Last LectureI. Matter Consists of Chemical Elementsa. Elements and CompoundsII. Structure of an Atomb.Subatomic Particlesc.IsotopesOutline of Current Lecture III. Continuation on Radioactive IsotopesIV. Energy Levels of Electronsa. Electron Distribution and Chemical Propertiesb. OrbitalsCurrent LectureI. Radioactive Isotope Purposesa. Dating Fossilsi. C-14= measures decay in fossils less than 50,000 years oldb. Tracing atoms through metabolic processesi. Incubationc. Diagnosing medical disordersi. Different types of cancersII. Energy Levels of Electronsa. Energy is the capacity to cause changeb. Potential Energy is the energy that matter has because of its location and structure.c. Potential energy in the electrons of an atom differd. The electron shell, or energy level, is an electron’s state of potential energyi. First shell= lowest energy levelii. Second shell= higher energy leveliii. Third shell (outermost shell)= highest energy levelElectron Distribution and Chemical PropertiesI. Chemical behavior in an atom is determined by the distribution of electrons in the electron shellsThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.II. The periodic table of elements shows the electron distribution for each element.a. Valence electrons are the electrons in the outermost shell, or the valence shell.i. Chemical behavior of an atom is mostly determined by the valance electronsii. Elements with a full valence shell are chemically inertOrbitalsI. Orbitals are the three dimensional space where an electron is found 90% of the timea. Each electron shell consists of a specific number of
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