Question 61 : the principal quantum number of an atom is related to the
1. spin angular momentum
2. orbital angular momentum
3. orientation of the orbital in space
4. size of the orbital
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Question 62 : Cathode rays are deflected towards__________.
1. positive electrode
2. both electrodes
3. negative electrode
4. none of the electrodes
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Question 63 : When electrons in an atom in an excited state fall to lower energy levels, energy is
1. released, only
2. absorbed, only
3. both released and absorbed
4. neither released nor absorbed
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Question 64 : A proton has approximately the same mass as
1. an electron
2. a neutron
3. a beta particle
4. an alpha particle
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Question 65 : When alpha particles are used to bombard gold foil, most of the alpha particles pass through undeflected. This result indicates that most of the volume of a gold atom consists of ____.
1. protons
2. neutrons
3. unoccupied space
4. deuterons
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Question 66 : Compared to the charge and mass of a proton, an electron has…
1. the same charge and the same mass
2. an opposite charge and the same mass
3. the same charge and a smaller mass
4. an opposite charge and a smaller mass
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Question 67 : An atom has a mass number of 23 and atomic number 1 The number of protons are_________.
1. 23
2. 12
3. 44
4. 11
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Question 68 : Which of the following statements does not form part of Bohr's model of the hydrogen atom.
1. The electron in the orbit nearest the nucleus has the lowest energy
2. Electrons revolve in different orbits around the nucleus
3. Energy of the electrons in the orbit is quantized
4. The position and velocity of the electrons in the orbit cannot be determined simultaneously
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Question 69 : The number of electrons in one molecule of are.
1. 44
2. 44
3. 88
4. 22
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Question 70 : The nucleus of helium contains
1. Two neutrons and two protons
2. Four protons
3. Four neutrons
4. Four protons and two electrons
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