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Atomic Structure Basics

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Published in: Physics
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Some slides contaning basics of atomic structure with diagrams

Mayank K / Delhi

3 years of teaching experience

Qualification: M.Sc. (Chemistry) IIT DELHI

Teaches: Chemistry

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  1. 2.6 Modern Atomic Theory -1926, Erwin Schrödinger proposed the quantum mechanical model of the atom which focuses on the wavelike properties of - the electron. - stated that it is impossible to know precisely where an electron is and what path it follows—a statement called the Heisenberg uncertainty principle. Modern Atomic Model Werner HeisenBerg 1927
  2. The Composition and Structure of the Atom 2.2 Composition of the Atom Atom — is the smallest unit of an element that retains the chemical properties of that element. Electron (e-) Proton (p+) Neutron (no) Neutrinos, gluons, quarks Distinct Regions of the Atom 1 tm 1 Ångst rom
  3. 2.2 Composition of the Atom Particle Electron Proton Neutron Mass grams 9.109 382 x 10-28 1.672 622 x 10-24 1.674 927 x 10-24 amu* 5.485 799 x 10-4 1.007 276 1.008 665 Charge coulombs -1.602 176 x 10-19 +1.602 176 x 10-19 +1 -The mass of the atom is primarily in the nucleus -The charge of the proton is opposite in sign but equal to that of the electron
  4. 2.2 Composition of the Atom Chemical Nuclear Symbol X = Chemical Symbol of the Element A = Mass Number Z = Atomic Number 6 A=12
  5. 2.2 Composition of the Atom Chemical Nuclear Symbol X = Chemical Symbol of the Element A = Mass Number = Number of Protons (p+) + Number of Neutrons (no) Z = Atomic Number = Number of Protons (p+) = Number of Electrons (e-) C = Charge = Number of Protons (p+) - Number of Electrons (e-) X = Chemical Symbol = C A = Mass Number = 12 Z = Atomic Number = 6 Protons = Atomic Number = 6 Neutrons = Mass number — Protons = 12 —6 = 6 Electrons = Protons — (Charge) = 6 — (0) = 6
  6. 2.2 Composition of the Atom Isotopes Isotopes — are atoms of the same element (same number of protons) having different atomic masses because they contain different number of neutrons. The Nuclei of the Three Isotopes of Hydrogen Protium 1 proton 1 1 proton 1 neutron H 1 proton 2 neutrons H
  7. 2.4 The Relationship between Light and Atomic Structure Electromagnetic Radiation (EMR) - Is energy that travels as waves through space. - visible light is a kind of EMR. - travel at a speed of 3.0 x 108 m/s -Is described in terms of wavelength (X) and frequency (v). 700 Rodio Visible light Microwave Infrared x.roys 107 Ene Increases 400 raye High energy energy -Wavelength and Energy are inversely proportional
  8. 2.4 The Relationship between Light and Atomic Structure Light Barium, 550 oo ann 450 agn 500 son 600 650 700 r 700 n, Emission Spectrum - Lines of different colors formed when light from a heated element passes through a prism.

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