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【单选题】
X 、 Y 、 M 、 N 是短周期主族元素,且原子序数依次增大。已知 X 原子的最外层电子数是电子层数的 3 倍, X 、 M 同主族, Y 原子在短周期主族元素中原子半径最大。下列说法正确的是 ( ) A . M 与 X 形成的化合物对应的水化物一定是强酸 B . Y 2 X 和 Y 2 X 2 中化学键类型相同,阴、阳离子的个数比相同 C .气态氢化物的热稳定性: M>N D .离子半径: r (X 2 - )> r (Y + )A.
B.
C.
D.
D
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A.
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There is something wrong with it.
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The air conditioning system is out of stock.
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The air conditioning system runs well.
【单选题】--- I’m sorry that I can’t go to your party tonight. ---- ______ ? Haven’t we agreed on it ?
A.
What is it
B.
Why don’t you
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What do you think
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