Conversation TwoQuestions 9 to 12 are based on the conversation you have just heard.
A. He's been there already.
B. He'll find life there difficult.
C. It's a bit risky to work there.
D. It's too cold for first-timers.
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Conversation TwoQuestions 9 to 12 are based on the conversation you have just heard.
An Internet company.
B. An information center.
C. A ski school.
D. A cruise ship.
在其原子具有下列外层电子构型的元素中，第一电离能最大的是
A. ns2np4
B. ns2np1
C. ns2np2
D. ns2np3
价电子构型为4f 75d16s2的元素在周期表中属于
A. 第四周期ⅦB族
B. 第五周期ⅢB族
C. 第六周期ⅦB族
D. 镧系元素
下列各种原子的核外电子排布中, 属于基态的是
A. 1s22s12p1
B. 1s22s22p33s1
C. 1s22s22p63s14s1
D. 1s22s22p63s23p64s1
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