Which of the following statements about electronic configurations of atoms and m

Question

Which of the following statements about electronic configurations of atoms and mononuclear ions, and atomic orbital quantum numbers, are true or false. true The principle quantum number can have any positive integer value. true The electronic configuration of Li^+ is 1s^2. false The value of m_l is always equal to n minus l. false The valence electronic configuration of oxygen is 2s^22p^4. true Fe^2+ has the same electronic configuration as Cr. For cations of the first transition series the 3d orbitals are significantly lower in energy than the 4s. Whereas in the neutral atoms the 4s and 3d orbitals are close in energy.

Explanation / Answer

The value of ml for a given l always ranges from -l to +l.

Valence electronic configuration of Oxygen is [He]2s22p4.

For cations of first transition series the 3d orbitals are significantly lower in energy than the 4s due to less number of electrons whereas in neutral atoms the 4s has lower energy than the 3d orbitals.

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