9. Consider the set of isoelectronic atoms and ions A2-, B-, C, D+, and E2+. Which arrangement of relative radii is correct? (A) A2- > B- > C > D+ > E2+ (B) E2+ > D+ > C > B- > A2- (C) A2- > B- > C < D+ < E2+ (D) A2- < B- < C > D+ > E2+ (E) None of these is correct.

15. Which of the following statements relating to molecular orbital (MO) theory is incorrect? (A) Combination of two atomic orbitals produces one bonding and one antibonding MO. (B) A bonding MO is lower in energy than the two atomic orbitals from which it is formed. (C) Combination of two 2p orbitals may result in either σ or π MOs. (D) A species with a bond order of zero will not be stable. (E) In a stable molecule having an even number of electrons, all electrons must be paired.

9. Consider the set of isoelectronic atoms and ions A^2-, B^-, C, D⁺, and E²⁺. Which arrangement of relative radii is correct?
(A) A^2- > B^- > C > D⁺ > E²⁺
(B) E²⁺ > D⁺ > C > B^- > A^2-
(C) A^2-> B^- > C < D⁺ < E²⁺
(D) A^2- < B^- < C > D⁺ > E²⁺
(E) None of these is correct.

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9. Consider the set of isoelectronic atoms and ions A2-, B-, C, D+, and E2+. Which arrangement of relative radii is correct?(A) A2- > B- > C > D+ > E2+(B) E2+ > D+ > C > B- > A2-(C) A2- > B- > C < D+ < E2+(D) A2- < B- < C > D+ > E2+(E) None of these is correct.

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