单选题 适中0.65 引用1 组卷200
某教材中有下面一段话:For many years chemists were unsuccessfully tried to prepare the perbromate ion,
。The first successful synthesis of perbromate involved an isoelectronic species as the starting material。The process is described as following:
。以下说法正确的是
A.该过程发生了化学变化 | B.Br元素的质量数为83 |
C. | D. |
23-24高一上·上海·期中
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氯元素有两种核素
Cl、
Cl。
(1)关于
Cl原子说法正确的是_______ 。
(2)
Cl、
Cl具有_______ 。
(3)
Cl、
Cl都属于氯元素,由此可知:_______ 决定元素种类,_______ 决定核素种类。
(4)
Cl、
Cl互为何种关系_______ ?
(5)写出与Cl-具有相同电子数的正离子、负离子、分子各一种:_______ 、_______ 、_______ 。
(6)Br、Cl都属于卤族元素。某教材中有下面一段话:
For many years chemists were unsuccessfully tried to prepare the perbromateion,BrO
。The first successful synthesis of perbromate involved an isoelectronic species as thestarting material。The process is described asfollowing:
SeO
→
BrO
+e-。以下说法正确的是_______ 。
(7)已知:氯元素的近似相对原子质量为35.5。STP下,11.2LHCl气体中含H35Cl_______ mol。
(1)关于
A.中子数等于质子数 | B.质子数等于电子数 |
C.质子数等于质量数 | D.电子数等于中子数 |
A.相同质量数 | B.不同质子数 | C.相同中子数 | D.相同电子数 |
(4)
(5)写出与Cl-具有相同电子数的正离子、负离子、分子各一种:
(6)Br、Cl都属于卤族元素。某教材中有下面一段话:
For many years chemists were unsuccessfully tried to prepare the perbromateion,BrO
A.该过程发生了化学变化 | B.Br元素的质量数为83 |
C. | D. |
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