题目

A、B、C、D为前四周期元素。A元素的原子价电子排布为ns2np2，B元素原子的最外层电子数是其电子层数的3倍，C元素原子的M能层的p能级有3个未成对电子，D元素原子核外的M能层中只有2对成对电子。 请回答下列问题： （1）当n=2时，AB2属于          分子（填“极性”或“非极性”），分子中 有       个σ键、       个π键。 （2）当n=3时，A与B形成的晶体属于       晶体。 （3）若A元素的原子价电子排布为3s23p2，A、C、D三种原子的电负性由大情景对话 A: Hello, Jenny ! Where are you going? B: Brain and I are going to school. 1 We are going to pick it up. A: It will take you long. B: 2 A: Can I join you? I studied pollution in class this morning. I know garbage is a type of pollution. B: That's fine. 3 A: All right, kook! I have several bags. 4 the plastic here and the paper here. B: People throw too much away! It's not right to waste things. 5 A: Yes. Let's put the sorted garbage in the big bag for recycling. A．Most of it can be recycled. B．We must finish it in an hour. C．We're going to pick it up. D．I'll put glass here, the metal here, E．This one is almost full. F．You can help us sort the garbage. G．We have lots of garbage.