题干

几种短周期元素的原子半径及主要化合价如下表:
元素代号
X
Y
Z
W
原子半径/pm
160
143
70
66
主要化合价
+2
+3
+5、+3、-3
-2
下列叙述正确的是                                      (  )

A:X、Y元素的金属性 X<Y

B:一定条件下,Z单质与W的常见单质直接生成2W2

C:Y的最高价氧化物对应的水化物能溶于稀氨水

D:一定条件下,W单质可以将Z单质从其氢化物中置换出来

上一题 下一题 0.0难度 选择题 更新时间:2017-07-10 12:38:50

答案(点此获取答案解析)

D

同类题2

阅读理解

    The booking notes of the play “Sherlock”

    Price: $10

    BOOKING

    There are four easy ways to book seats for the performance:

    in person

    The Box Office is open from Monday to Saturday, 10 am—8pm

    by telephone

    Ring 01324976 to reserve your tickets or to pay by credit card (Visa and MasterCard).

    by post

    Simply complete the booking form and return it to Box Office.

    --online

    Complete the online booking form at www.Satanfiedtheatre.com.

    DISCOUNTS:

    Saver: $2 off any seat booked any time in advance for performances from Monday to Thursday. Saver s are available for children up to 16 years old, over 60s and full-time students.

    Supersavers: half-price seats are available for people with disabilities and one companion. It is advisable to book in advance. There is a maximum of eight wheelchair spaces available and one wheelchair space will be held until an hour before the show.

    Standby: best available seats are on sale for $6 from one hour before the performance for people suitable for Saver and Supersaver discounts and thirty minutes before for all other customers.

    Group Booking: there is a ten percent discount for parties of twelve or more.

    School: school parties of ten or more can book $6 standby tickets and will get every tenth ticket free.

    Please note: we are unable to exchange tickets or refund money unless a performance is cancelled due to unforeseen circumstances.