38. Which of the following atoms or ions has three unpaired electrons? (A) N (B) O (C) Al (D) S2– (E) Ti2+

6. Which of the following statement is true? (A) It is impossible to satisfy the octet rule in XeF2. (B) Because SF4 exists, OF4 should also exist because O and S are in the same family. (C) In O3, one O-O bond is stronger than the other. (D) All elements with n = 2 must obey octet rule. (E) CO3 2- keep switching among three resonance structures.