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【单选题】
关于离子键、共价键的各种叙述中，下列说法中正确的是（　　）
A.
在离子化合物里，只存在离子键，没有共价键
B.
非极性键只存在原子的单质分子（如Cl 2 ）中
C.
原子序数为11与9的元素能够形成离子化合物，该化合物中存在离子键
D.
由不同元素组成的含多个原子的分子里，一定只存在极性键
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