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Which of the following series of transitions in the spectrum of hydrogen atom falls in visible region?

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Important Questions on Structure of Atom

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Magnesium reacts with an element X to form an ionic compound. If the ground state electronic configuration of X is 1s2 , 2s2,  2p3, the simplest formula for this compound is
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Which one of the following statements is wrong?
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How many electrons can fit in each orbital for which n=3 and l=1?
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Which of the following pairs of d-orbitals will have the electron density along the axis?
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Two electrons occupying the same orbital are distinguished by:
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The number of d-electrons in Fe2+ (Z=26) is not equal to the number of electrons in which one of the following?
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The angular momentum of electron in d-orbital is equal to