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Which quantum number defines the orientation of an orbital in the space around the nucleus?

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Important Questions on Structure of Atom

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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-4>Q 17
For similar orbitals having different values of n:
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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-4>Q 18
Maximum number of total nodes is present in:
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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-4>Q 19
The possible set of quantum numbers for the unpaired electron of chlorine is:
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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-4>Q 20
Which of the following has the maximum number of unpaired electrons?
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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-4>Q 21
The angular velocity of an electron occupying the second Bohr orbit of He+ ion is:
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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-4>Q 22
An excited state of H-atom emits a photon of wavelength λ and returns to the ground state, the principal quantum number of the excited state is given by which of the following?
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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-4>Q 23
Light of wavelength λ strikes a metal surface with intensity X and the metal emits Y electrons per second of average energy Z. What will happen to Y and Z if X is havled?
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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-4>Q 24
Neutron scattering experiments have shown that the radius of the nucleus of an atom is directly proportional to the cube root of the number of nucleons in the nucleus. From Li37  to Os78180, the radius is: