5.2 QUANTUM THEORY AND THE ATOM PART 2 The quantum mechanical model of the atom.
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Transcript of 5.2 QUANTUM THEORY AND THE ATOM PART 2 The quantum mechanical model of the atom.
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5.2 QUANTUM THEORY AND THE ATOMPART 2
The quantum mechanical model of the atom
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We left off with Bohr’s model of the atom. What did it do for us? What did it not do?
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The quantum mechanical model of the atom successfully describes
electrons in all elements, both conceptually and mathematically
Like Bohr’s model, electrons can only exist ____________________ however- there are differences…
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1. In quantum mechanics, electrons are treated as _________________ (Bohr treated them as ___________________)
De Broglie’s idea was that if light can have both wave and particle characteristics –
_________________(Note: this actually explains Bohr’s idea that electrons can only exist in certain energy levels.)
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2. Also, you can never know exactly where an electron is… you can only predict the probability of it being found in a certain area of space. Why is this so?
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This is called the
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The Principle states:The more you know about an electron’s _______and ________, the less you know about its___________, and vice versa
Experimental evidence for the Principle
Heisenberg was driving down the road, and was stopped by a police officer.“Sir,” says the officer, “do you know how fast you were going?!” Heisenberg says “no , but I know...”( finish his sentence)
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Schrodinger developed the
These mathematically describe the electron as a wave, and they work for all elements
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To review: The quantum mechanical model of the atom includes ideas from:
*note: other scientists also contributed
SCIENTIST HIS CONTRIBUTION
BOHR
DE BROGLIE
HEISENBERG
SCHRODINGER
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How is the quantum mechanical model of the atom going to help us this year in our quest to understand
how things happen in our world?
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We will use the solutions to the Schrodinger wave equations which involve
quantum numbers. Quantum numbers describe electrons, and
areas where electrons may be found/how the
electrons are arranged around the nucleus. In other words, from quantum numbers we can
derive electron configurations
Why are electron configurations important?
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Remember – chemistry is based on electrons and how they are arranged; so determining electron configurations is the first step in explaining how
chemistry – and the world - work!