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For a one-electron atom, the set of allowed quantum numbers is:

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Important Questions on Structure of Atom

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The pair of atoms having the same number of neutrons is
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The radii of the first Bohr orbit of HrH, He+rHe+ and Li2+rLi2+ are in the order
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The graph that depicts Einstein's photoelectric effect for a monochromatic source of frequency above the threshold frequency is
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The fraction of volume occupied by the nucleus with respect to the total volume of an atom is:
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Which of the following is isoelectronic with neon?
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The MRI (magnetic resonance imaging) body scanners used in hospitals operate with 400 MHz radio frequency energy. The wavelength corresponding to this radio frequency is:
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Photon of which light has maximum energy?

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Electromagnetic radiations of wavelength 242 nm is just sufficient to ionise sodium atom. Then, the ionisation energy of Sodium in kJ mole-1 is: