下列符号能同时表示一个原子、一种元素和一种物质的是 A. O2    

下列符号能同时表示一个原子、一种元素和一种物质的是

A. O2        B. Zn         C. N          D. Ca2+

答案

B


解析:

A、不表示一个原子C、不表示一种物质 D、不表示一种物质、不是一个原子

相关题目

如图所示:已知:①甲、乙、丙、丁均为前三周期元素的单
如图所示:已知:①甲、乙、丙、丁均为前三周期元素的单质。②在一定条件下甲与丙和甲与丁都按物质的量之比1∶3反应,分别生成X和Y,在产物中
推动经济全球化的主要因素是     ①科技进步         
推动经济全球化的主要因素是     ①科技进步                  ②跨国公司  ③发展中国家经济的发展      ④一个国家的民族工业兴起 A.
 -Could you bring me an English newspaper?  -Certainly, sir. I'll bring_____
 -Could you bring me an English newspaper?  -Certainly, sir. I'll bring_______ as soon as possible.     A. one                B. it                   C. that 
 汉武帝为加强对地方官僚的监察、控制而采取的措施是   
 汉武帝为加强对地方官僚的监察、控制而采取的措施是       A. 实行察举制         B. 设置刺史             C. 取消封国          D.
Mr. Smith worked in a post office and three years ago, when he was sixty, he re
Mr. Smith worked in a post office and three years ago, when he was sixty, he retired. So he has a lot of free time now. He likes neither reading nor watching TV. He feels bored and he goes to visit
启蒙运动中,最早提出人们通过社会契约创立国家的是(  
启蒙运动中,最早提出人们通过社会契约创立国家的是(    )A.霍布斯   B.洛克      C.孟德斯鸠    D.卢梭
任务性阅读     Today is Kate’s birthday and she’s fifteen. Now she
任务性阅读     Today is Kate’s birthday and she’s fifteen. Now she is with her family. Let’s meet her family. Her father’s name is Smith. He works in a hospital. People think①他
81-year-old man helped poor studentsOn December 2, 2009, in No.1 High School, Ya
81-year-old man helped poor studentsOn December 2, 2009, in No.1 High School, Yaling Town, Yichuan County, Luoyang, an old man with a stick is taking 300 notebooks and 120 ball pens out of a bag. He i