下列五种物质中,①Ar  ② ③  ⑤,只存在共价键的是        

下列五种物质中,①Ar  ② ③  ⑤,只存在共价键的是          ,只存在离子键的是          ,既存在离子键又存在共价键的是          ,不存在化学键的是          。属于共价化合物的是          属于离子化合物的是         

答案

(6分,每空一分)

②③;   ⑤;

④;   ①;

②③;    ④⑤

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