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NEET UG CHEMISTRY MCQ: STRUCTURE OF ATOM
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The Bohr’s orbit radius for the hydrogen atom (n=1) is approximately 0.53 Å. The radius for the first excited state (n=2) orbit is
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Correct option: C
2.12 Å
Option C (2.12 Å) is correct because the radius of the nth orbit is proportional to , so the radius of the first excited state (n=2) is 4 times the radius of the ground state (n=1).
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Reason: The oscillating electric and magnetic fields produced by oscillating charged particles are parallel to each other and both are perpendicular to the direction of propagation of the wave. S-I: The orbital has maximum electron density along the y axis and its nodal plane is xz plane.
S-II : For a given atom, for all values of , the -orbitals have the same shape, but the overall size decreases as '' increases. S-I: Elements like and were discovered when their minerals were analysed by spectroscopic methods.
S-II: The element helium was discovered in the sun by spectroscopic method. In which one of the following, the number of protons is greater than number of neutrons but number of protons is less than the number of electrons?