問題詳情

2. Consider the following orderings.
I. F＜Si＜Ba II.  S＜Te＜Se  III. Be＜Na＜Rb  IV. O＜Fe＜P
Which of these give the correct trend in order of increasing size?
(A) III
(B) I, II
(C) I, III
(D) I, IV
(E) I, III, IV

參考答案