下列说法中正确的是 （ ）
①所有基态原子的核外电子排布都遵循构造原理 ②同一周期从左到右，元素的第一电离能、电负性都是越来越大 ③金属键、共价键和氢键都具有相同的特征：方向性和饱和性 ④所有的配合物都存在配位键，所有含配位键的化合物都是配合物 ⑤所有含极性键的分子都是极性分子 ⑥所有金属晶体中都含有金属键 ⑦所有的金属晶体熔点肯定高于分子晶体
| A．③⑥⑦ | B．⑥ | C．③④⑤ | D．①②⑥⑦ |
相关试题
Progress______ so far very good and we are sure that the work will be finished on time.
| A．was | B．had been | C．has been | D．will be |
Charles was alone at home, with_______ looking after him.
| A．someone | B．anyone | C．not one | D．no one |
It is often ______ that human beings are naturally equipped to speak.
| A．said | B．to say | C．saying | D．being said |
I can’t leave. She told me that I ______ stay here until she comes back.
| A．can | B．must | C．will | D．may |
—— ______ , as a matter of fact
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