PPT-7.1-7.3 The Nature of Light – Atomic Spectroscopy and the Bohr Model

The Nature of Light The quantummechanical model aka the electron cloud model An atomic model that explains the strange behavior of electrons Electrons determine the chemical and physical properties of elements. Lab no. 6. In . analytical chemistry. , . Atomic absorption spectroscopy. (AAS). . is a technique for determining the concentration of a particular metal . element. . (e.g. Fe, Cu, Al, Pb, Ca, Zn). Bohr Model diagrams are used to represent the electron structures of elements. Protons and neutrons are placed in the middle to represent the nucleus. Electrons are placed in the electron shells. Making a Bohr Model. In . analytical chemistry. , . Atomic absorption spectroscopy. (AAS). . is a technique for determining the concentration of a particular metal . element. in a sample. (e.g.. Fe, Cu, Al, . Pb. , Ca, Zn).. From Astronomy To Biomedicine. Light and Matter .  Spectroscopy. . Generalized interactions  Radiation. . Atomic physics. . Astrophysics. . Plasma physics. . Molecular physics. . Biophysics. Advanced Chemistry. Ms. . Grobsky. Food For Thought. Rutherford’s model became known as the “planetary model”. The “sun” was the positively-charged dense nucleus and the negatively-charged electrons were the “planets”. Bohr’s model explained an unusual event. When electric current flows through a gaseous element, the gas . produces a glowing light, like a neon sign.. If this light is passed through a prism, a pattern of lines appears, with each line having a different color. The pattern depends on the element- neon has one pattern and helium another. What causes these lines and why are they always the same for a given element?. Review for Quiz. Match the Atomic Model to the Person who designed the model.. Use the Models Above . Niels. Bohr. John Dalton. Ernst Rutherford. J.J. Thomson. Niels. Bohr - D. John Dalton - A. Ernst Rutherford - C. Chapter 9: Electrons in Atoms and the Periodic Table. Learning Goals. Compare the wave and particle natures of light.. Define a quantum of energy, and explain how it is related to an energy change of matter.. Standing waves. Quantum energy . of colors . Bohr Model . (particle picture). Assumptions. Nuclear model. Discrete electron orbits n = 1,2,3,... Light absorbed/emitted as quantum. . of energy when electron jumps orbit. Mrs. Medina. 1. Why do metals glow when heated?. 2. Models of the Atom. A model should explain not just what the material is made of (composition) but also how it is going to behave (changes).. Rutheford’s. Light is an electromagnetic wave*.. Wave Characteristics. Frequency (. ν. ). : number of waves that pass a point in a given period of time. Total . energy. is proportional to amplitude and frequency of waves. . Kelebihan. . Niels. Bohr. Kekurangan. . Niels. Bohr. KELUAR. Gambar. . Niels. Bohr . dan. Model Atom . Niels. Bohr. . Teori. Atom . Niels. Bohr. Kelompok. 3 :. Wahyu. . Trifandi. . Octa. Chapter 5. Sub Topics. Introduction to Atomic Spectroscopy. Atomic . Absorption Spectroscopy AAS. Atomic . Emission . Spectroscopy. AES. Interferences and Comparisons. Atomic Absorption and Emission Spectroscopy. Quiz. Stability of atoms. Ultraviolet catastrophe. Bohr Model . bootcamp. PHYS274 Midterm I and related announcements. Midterm I on . Oct 16. th. , Monday. Professor . Pui. Lam will substitute for me, Oct 6-18, while I am away at KEK.