Which of the following statements is true? . The ground-state energy for a syste

Question

Which of the following statements is true? . The ground-state energy for a system obtained using the variational method is less than the true ene . The charge density of a filled shell is spherically symmetrical. rgy correlation energy is the difference between the exact energy and the Hartree Fock energy in the limit of an infinite basis set magnitude of the electron affinity for a given element is greater than the magnitude of the first ionization energy O B and C O A and O C and D O A and B Submit

Explanation / Answer

Ans:

B and C are true.

B) the charge density of a filled shell is spherically symmetrical. this is a true statement. Even charge density of half-filled shell is also spherical symmetrical.

C) By defination, the correlation energy is the difference between the exact energy and the Hartree-Fock energy in the limit of an infinite basis set.

other two statements are not true.

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