7. 下列哪些為放熱過程? (A) C (diamond)→C (graphite) (B) F (g) + Cl− (g)→F− (g) + Cl(g) (C) Cu:[Ar]3d94s2→Cu:[Ar]3d104s1 (D) O:1s22s22px12py12pz2 → O:1s22s22px22pz2 (E) Na+ (g) + K(g)→Na(g) + K+ (g)