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1176_Physics ProblemsTechnical Physics

1176_Physics ProblemsTechnical Physics - Chapter 42 517...

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Chapter 42 517 Q42.16 The three elements have similar electronic configurations. Each has filled inner shells plus one electron in an s orbital. Their single outer electrons largely determine their chemical interactions with other atoms. Q42.17 When a photon interacts with an atom, the atom’s orbital angular momentum changes, thus the photon must carry orbital angular momentum. Since the allowed transitions of an atom are restricted to a change in angular momentum of A = ± 1 , the photon must have spin 1. Q42.18 In a neutral helium atom, one electron can be modeled as moving in an electric field created by the nucleus and the other electron. According to Gauss’s law, if the electron is above the ground state it moves in the electric field of a net charge of + = + 2 1 1 e e e We say the nuclear charge is screened by the inner electron. The electron in a He + ion moves in the field of the unscreened nuclear charge of 2 protons. Then the potential energy function for the electron is about double that of one electron in
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