Which of the following is true ?

  1. A

    The outer electronic configuration of the ground state chromium atom is 3d44s2.

  2. B

    Gamma rays are electromagnetic radiations of wavelength of 106  cm  to  105cm.

  3. C

    The energy of the electron in the 3d orbital is less than that in the 4s orbital of a hydrogen atom.

  4. D

    The electron density in the xy-plane in 3dx2y2 orbital is zero.

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    Solution:

    (a) False. The configuration is 3d54s2.

    (b) False. The wavelength of gamma rays is of the order of 10-11 m.

    (c)True. In hydrogen atom, the energy of an electron depends only on the principal quantum number of the orbital which it occupies.

    (d) False. In xz-plane, there is no electron density if an electron occupies 3dx2y2 orbital.

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