4. Arrange the following atoms in order of increasing first ionization energy (from least to greatest): Be, B, N, O, F. Which of the following sequences is correct?
(A) Be＜B＜N＜O＜F
(B) B＜Be＜O＜N＜F
(C) B＜O＜Be＜N＜F
(D) B＜Be＜N＜O＜F
(E) Be＜B＜O＜N＜F

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