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Published byAlice Linette Lloyd Modified over 3 years ago

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Electromagnetic Spectrum

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Atomic Emission Spectrum

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Continuous Spectrum

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Glowing Metal

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Photoelectric Effect

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Click On Picture

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Bohr Model (review) Only works for hydrogen atoms Electrons don’t move in circles The energy was right, but not because e - circle like planets

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The Hydrogen Spectrum

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The Bohr Ring Atom n = 3 n = 4 n = 2 n = 1

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Quantum Mechanical Model Louis de Broglie - 1924 –Matter could move like a wave –Like standing waves –The vibrations of a stringed instrument

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Schrödinger Equation

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Quantum Numbers A set of 4 “numbers” that describe an electron Tell us –Energy level –Shape of orbital –Orientation of orbital around nucleus –Spin

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Principal quantum number Principal quantum number (n) –Energy level of the electron –7 energy levels –Correspond to 7 periods (rows) of periodic table

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Angular Momemtum Quantum Number Energy levels are divided into sublevels called orbitals An ORBITAL is a region in space where there is a high probability of finding an electron

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Orbitals Denoted by the letters s, p, d, and f Each orbital can hold 1 or 2 electrons only!

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S orbitals l = 0 1 orbital per energy level

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P orbitals 3 orbitals per energy level

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P orbitals l = 1 3 orbitals per energy level

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D orbitals l = 2 5 orbitals per energy level

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F Orbitals l = 3 7 orbitals per energy level

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Magnetic Quantum Number Magnetic quantum number (m I ) Gives the axis orientation Tells direction in each shape (x,y,z)

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Spin Quantum Number Describes the direction the electron is spinning.

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Spin Quantum Number Describes the direction the electron is spinning.

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Electron Configuration We follow 3 rules to get the correct electron configuration for each atom 1.Aufbau Principle 2.Pauli exclusion Principle 3.Hund’s Rule

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Energy Levels in atoms SublevelsOrbitals

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Energy Levels in atoms SublevelsOrbitals

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