electrons in atoms. hw review 2.5 the element magnesium consists primarily of three isotopes: 24 mg,...
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Electrons in Atoms
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HW Review2.5
The element magnesium consists primarily of three isotopes: 24Mg, 25Mg and 26Mg. The composition of naturally occurring magnesium is 79% 24Mg, 10% 25Mg, and 11% 26Mg. Find the atomic mass of Mg. (Assume that the mass of each isotope is equal to its mass number)
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HW Review2.6
For each of the following atoms, indicate the number of protons, neutrons, electrons, and nucleons:
a) K b) C c) Ar3919
14 6
4018
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Emission Spectroscopy• The study of the energy (electromagnetic radiation) given off by excited atoms.
• Much of what is known about atoms is from studies of the energy given off by excited atoms.
• Atoms of elements are normally in the ground state, but if energy is added, electrons can jump energy levels and become “excited”.
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Excited atoms give off energy in the form ofElectromagnetic Radiation when their electrons return to the Ground State.
E = hf
More Energy = Higher Frequency (Blue)
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Ground State
• Ground State • normal place• lowest energy level
From Periodic Table:• Ground State of Na
• 2-8-1
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Excited State• Excited State
• Higher than normal energy level• By heat or electricity
• Excited State of Na:2-7-22-6-3
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Electron's 'jump' and 'fall' to precise energy levels.
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Excited State
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Quantum Leap
• Fixed amount of energy needed to go from one energy level to another.
• Need all the energy to go from one energy level to another. Half the energy won’t move you.
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Continuous Spectrum
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Bright Line Spectrum
Bright Line Spectrum for Hydrogen
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Spectroscope
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Since each element has a particular set of energy jumps, they also have a particular bright line spectrum.
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Atomic Emission Animations
• Excited State Atom Youtube Video• Line Spectrum of Hydrogen Atom Youtube
Video• Flame Test Video
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Learning Check:• When does light come out?
When electron transitions from:
a) The ground state to excited state.
b) The excited state to ground state.