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In an orbital, for which and , how many electrons can fit?
(a)
(b)
(c)
(d)

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Important Questions on Structure of Atom
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Which one of the following ions has electronic configuration [Ar]

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HARD
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In Bohr series of lines of hydrogen spectrum, the third line from the red-end corresponds to which one of the following inter-orbit jumps of the electron for Bohr orbits in an atom of hydrogen?
