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Part I: PhET simulation of different theories of atoms Part II: Analyze Spectroscope Data. Niels Bohr. - PowerPoint PPT Presentation
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Part I: PhET simulation of different theories of atoms
Part II: Analyze Spectroscope Data
Niels BohrBorn in Denmark (1885-1962) Bohr received his poorest marks in composition and struggled with writing during his entire life. In fact, he wrote so poorly that he was forced to dictate his PhD thesis to his mother. He constructed a quantum model for the hydrogen atoms by the time he was 27 years old and won the Nobel prize in physics in 1922.
Bohr’s Model1. e- orbit the nucleus at only certain
energy levels or are “quantized”.
2. Energy of an e- in the nth orbit of H atom is En = - Rhc/n2
3. R=Rydberg constant, 1.097 x 107/m
4. The radius of orbits is called the Principle Quantum Number
5. Atom in ground state is e- in lowest energy level. (more energy is less negative) (lowest energy is highest negative number)
Absorption of energy when an atom moves to an excited energy level.
DE = E final – E initial
DE = E2 – E1= (-Rhc/22) – (- Rhc/12)
= ¾(Rhc) = 984 kJ/mol of H atoms
Some of the electronic transitions that can occur in an excited H atom.
Ionization energy the energy to remove the e- from the atom n = ∞ and can be measured in the laboratory.