短周期金属元素甲～戊在元素周期表中的相对位置如右表所示： _爱下问搜题

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问题选择题

短周期金属元素甲～戊在元素周期表中的相对位置如右表所示：

下面判断正确的是

A．原子半径: 丙<丁<戊 B金属性：甲>丙

C．氢氧化物碱性：丙>丁>戊 D．最外层电子数：甲>乙

答案

答案：C

同周期自左向右原子半径逐渐减小，金属性逐渐减弱，最高价氧化物的水化物的碱性逐渐减弱，A不正确，C正确。同主族自上而下金属性逐渐增强，B不正确。同周期自左向右最外层电子数逐渐增多，D不正确，答案选C。

完形填空

完型填空。

      Kate is     1     English girl. Her mother is a teacher, and her father is a doctor. She     2     a brother. His
name is Jim. Kate is eight years old, and her brother is twelve. Now, their family is     3    the U. S. They're
having fun in the U. S. Kate is     4    TV. Jim is sending an e-mail     5     his friend, and their mother and
father are cooking now.

( ) 1. A. a
( ) 2. A. have
( ) 3. A. in
( ) 4. A. watch
( ) 5. A. from

B. an
B. /
B. at
B. watches
B. of

C. the
C. has
C. /
C. watching
C. for

D. /
D. is
D. go
D. watched
D. to

判断题

供电系统的不拉闸限电，应列入可靠性的统计范围，每限电一次应计停电一次，停电用户数应为限电的实际户数，停电时间为实际的停电时间，停电容量为减少的供电容量。