A，B为主族元素中的两种，元素A的阳离子与元素B的阴离子具有相同的电子层结构，以下关于A，B元素性质的比较中，正确的是
①原子半径A＜B②原子序数A＞B③原子最外层电子数B＞A④元素所在的周期数A＞B⑤A的最高正价与B的最低负价的绝对值相等
| A．②③④ |
| B．①② |
| C．④⑤ |
| D．②⑤ |
相关试题
—— Do you mind my opening the window? It’s a bit hot in here.
—— ______ , as a matter of fact
| A．Go ahead | B．Yes, my pleasure |
C．Yes, I do | D．Come on |
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| A．too much long | B．much too long |
C．long too much | D．too long much |
My friend showed me round the town, ______ was very kind of him. 
| A．which | B．that | C．where | D．it |
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| A．being run | B．run | C．to run | D．running |
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