Which of the following is true ?A. The outer electronic configuration of the ground state chromium atom is `3d^4 4 s^2`.B. Gamma rays are electromagnetic radiations of wavelength of `10^-6 cm` to `10^-5 cm`.C. The energy of the electron in the `3d` orbital is less than that in the `4s` orbital of a hydrogen atom.D. The electron density in the `xy-"plane"` in `3 d_(x^2 - y^2)` orbital is zero.

Which of the following is true ?A. The outer electronic configuration

1.	Which of the following is true ?A. The outer electronic configuration of the ground state chromium atom is `3d^4 4 s^2`.B. Gamma rays are electromagnetic radiations of wavelength of `10^-6 cm` to `10^-5 cm`.C. The energy of the electron in the `3d` orbital is less than that in the `4s` orbital of a hydrogen atom.D. The electron density in the `xy-"plane"` in `3 d_(x^2 - y^2)` orbital is zero.
Answer» Correct Answer - C ( c) (a) False. The configuration is `3 d^5 4 s^1`. (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 `3 d_(x^2 - y^2)` orbital.

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