短文改错

     This autumn my class went to Dalian to go the camping. We arrived at a sandy beach

with a well view of the sea. We set up our tents on the sandy beach, when night fell we

made a fire to give us light and kept us warm. All the classmates sat around them, talking

and laughing. Several hours late, Li Mei and I went back to the tent to have a chat. We

stayed up all of night. We found that we two had a lot of common. For instance, we both

like the same singers and have great enthusiasm for physics. The fire and the stars see our

happiness. What I wished time would stop at that moment!

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（7分）（1）在配合物Ni(CO)₄和 [Cu(NH₃)₄]²⁺,[Fe(SCN)]²⁺配合物离子中，提供空轨道接受孤对电子的原子或离子分别是：_______________、___________、___ __________。

（2）H₃O⁺的空间构型为：___________________________，BCl₃的空间构型为：___________

（3）按要求写出第二周期非金属元素构成的中性分子的化学式：（只需写一种）

平面三角形分子________________，三角锥形分子_________________________。