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Chapter 5

Electron Configuration

What are energy levels? fixed energies an electron can have (s,p,d,f)- different shapes
What is a quantum? the amount of energy required to move an electron from one energy level to another energy level
What is the quantum mechanical model used for? solving mathematical equations and it determines the allowed energies for an electron and its possible locations
What is an atomic orbital often thought of as? a region of space where there is a high probability of finding an electron (hold 2 e-)
What are the different inadequacies in Rutherford's atomic model? it couldn't explain the chemical properties of elements
What did Rutherford's model explain? what leads to chemical properties of an element, which requires a model that better describes the behavior of electrons- flame test
What is the Bohr Model (aka "Planetary Model)? in his model the electrons are only found in specific circular paths, or orbits around the nucleus
What does each electron have in the Bohr Model? fixed energy that determine what energy level it is in
In the Bohr Model, what must the electron do to move to another energy level? absorb a quantum of energy
How did Niels Bohr change and improve Ernest Rutherford's Model? He included newer discoveries about how the energy of an atom changes when it absorbs or emits light. He also considered hydrogen which has one electron.
What is electron configuration? the ways that e- are arranged into various orbitals
What is a spin? (up arrow or down arrow)
What are principal energy levels? (1,2,3, etc.)
What is the Aufbau Principle? electrons occupy the orbitals of lowest energy first
What is the Pauli Exclusion Principle? each orbital can only hold up to 2 e-; if 2 e- occupy one orbital, they must have opposite spins
What is the Hund’s Rule? e- occupy orbitals in a way that makes the # of e- with the same spin direction as large as possible. They fill orbitals singly first, and "single" e-s all have spins in the same direction
What is ground state? lowest energy arrangement
What is excited state? atom attains a higher energy arrangement
Created by: dwigmans13



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