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Chapter 13 Electrons Models of the Atom Electron Arrangement Physics and the Quantum Mechanical Model
Chapter 13.1 Models of the Atom The atom was considered a solid indivisible mass originally http://www.youtube.com/watch?v=uhgd9VM9rsM
Thomson Model Plum – Pudding Atom: Negatively charged electrons stuck into a lump of positively charged material.
Rutherford Model Electrons surround a dense nucleus made of protons and neutrons. The rest of the atom was empty space
Bohr Model (Planetary Model) Electrons are arranged in concentric circular paths (orbits) around the nucleus. Patterned after the motion of the planets Electrons have a fixed energy
Quantum Mechanical Model Primarily a mathematical model Restricts electron to certain energy levels No defined path for electrons Gives a percent chance of finding an electron in a certain space
Quantum Amount of energy required to move an electron from its current energy level to the next highest energy level
Fixed Energy Levels Rungs of a Ladder Garden Steps
Orbits S orbital P orbital D orbital F orbital
Chapter 13.2 Electron Arrangement Electron Configurations Exceptional Electron Configurations
Electron Configurations The way in which electrons are arranged around the nuclei of an atom. Three Rules: –Aufbau Principle –The Pauli Exclusion Principle –Hund’s Rule
Aufbau Principle Electrons enter orbitals of lowest energy first. Some orbitals overlap between different energy levels
The Pauli Exclusion Principle An atomic orbital may describe at most two electrons One or two electrons may occupy one orbital They will have opposite spins (shown by opposite arrows)
Hund’s Rule When electrons occupy orbitals of equal energy, one electron enters each orbital until all the orbitals contain one electron with parallel spins.
Ch. 13 Electrons in Atoms Ch Models of the Atom
Chapter 4 Atomic Structure.
Expanding the Theory of the Atom
Chapter 13: Electrons in Atoms
1 Chapter 13 Electrons in the atom 2 Atomic Theory Dalton Dalton Atom – What would his atom look like? Atom – What would his atom look like? Rutherford.
Chapter 13 Electrons in Atoms. Section 13.1 Models of the Atom OBJECTIVES: l Summarize the development of atomic theory.
Chapter 5 “Electrons in Atoms”
Cook. At the end of the 19 th Century, scientists began to probe the submicroscopic world of atoms Development of atomic models John Dalton: Thought.
Chapter 5 Models of the Atom.
Quantum Mechanical Model: Electron Configurations
ELECTRON CONFIGURATIONS “THE ADDRESSES OF ELEMENTS”
Chapter 13 Section 2 electron configuration- how e- are arranged around the nucleus Rules for e- configs: 1)Aufbau Principle -electrons enter orbitals.
Electron Configuration Topic #8 September How was the Atomic Model developed?
Chapter 5 Notes Electron Models. Evolution of Electron Models The first model of the electron was given by J.J. Thompson—the electron’s discoverer. His.
The Rutherford’s model of the atom did not explain how an atom can emit light or the chemical properties of an atom. Plum Pudding Model Rutherford’s Model.
Chapter 13 Electrons in Atoms
Electrons in Atoms. Models of the Atom – A History John Dalton John Dalton atom was solid, indivisible mass atom was solid, indivisible mass J.J. Thomson.
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