Question

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8) In the Bohr model of the atom, A) electrons travel in circular paths called orbits B) electrons can have any energy C) electron energies are quantized D) electron paths are controlled by probability E) both A and C 9) The uncertainty principle states that_ A) matter and energy are really the same thing B) it is impossible to know anything with certainty C) it is impossible to know the exact position and momentum of an election D) there can only be one uncertain digit in a reported number E) it is impossible to know how many electrons there are in an atom 10) The line nature of the emission spectrum of the hydrogen atom suggests that: A) The atom is composed of a small positive nucleus and electrons. B) There are many electrons in a hydrogen atom. C) The position and energy of an electron cannot be determined simultaneously. D) The energies of electrons are quantized. E) None of the above is true. 11) The A) spin B) magnetic C) principal quantum number defines the shape of an orbital. D) angular momentum E) psi

Answer 1

8. Option E

In Bohr's Model, the first postulate states that, electron travel around the nucleus in circular orbit.

The Second postulate states that as long as an electron is in same orbit it would neither loose nor gain energy. Thus energy is quantized.

9. Option C

Uncertainty principle says that it is impossible to determine the exact momentum and location of an electron simultaneously in an orbit.

10. Option D

The line spectrum which is not same as the continuos spectrum shows that energy of electron at different orbit levels are quantized. Had they not been so, wo would have obtained a continuos spectrum.

11. Option D

The Angular momentum quantum number specifies the shape of the Orbital.