某基态原子R的价电子构型为ns2np1,下列判断错误的是[ ]
A.属于电负性很大的元素
B.属于第n周期元素
C.属于第ⅢA(主族)元素
D.属于p区元素
答案:A
在等比数列{an} 中,若a6-a4=216,a3-a1=8,Sn=40,求q、a1及n.
Most members of the committee were in favour of the suggestion; only a(n)________were against it. [ ]
A. majority
B. minority
C. quantity
D. amount