决定元素种类的是 (      ) A.质子数       B.电子数   

决定元素种类的是 (     

A.质子数       B.电子数      C.中子数      D核外电子数

答案

D

相关题目

在遗传学上,把杂种后代中显现不同性状的现象叫做( ) A
在遗传学上,把杂种后代中显现不同性状的现象叫做( ) A.显性和隐形     B.相对性状  C.性状分离 D.遗传规律
甲、乙两种物质的溶解度曲线如右图所示,下列叙述错误的
甲、乙两种物质的溶解度曲线如右图所示,下列叙述错误的是:A.t1℃时,甲的溶解度小于乙的溶解度B.t1℃时,加入甲物质,可使不饱和的甲溶液变
28. 1947年美国提出的“欧洲复兴计划”为西欧14个国家所接受
28. 1947年美国提出的“欧洲复兴计划”为西欧14个国家所接受。双方约定,美国提供的美元必须用来购买美国的援欧物资,所有受援国应对美国在关税、
The doctor advised Verea strongly that she should take a holiday, but ____didn
The doctor advised Verea strongly that she should take a holiday, but ____didn’t help. A. it                   B. she               C. which            D.
My fiance (未婚夫) and I were excited about shopping for our first home. But
My fiance (未婚夫) and I were excited about shopping for our first home. But our funds were  16  , and none of the houses in our price range seemed satisfactory. One agent  17  a house in pa
陈毅在《记淮海前线见闻》诗中写道:“几十万民工走不通
陈毅在《记淮海前线见闻》诗中写道:“几十万民工走不通。骏马高车送粮食,随军旋转逐西东,前线争立功。”出现这种情景的前提是(      ) A
氯酸镁[Mg(ClO3)2]常用作催熟剂、除草剂等,实验室制备少量Mg(
氯酸镁[Mg(ClO3)2]常用作催熟剂、除草剂等,实验室制备少量Mg(ClO3)2·6H2O的流程如下: 已知:卤块主要成分为MgCl2·6H2O,含有MgSO4、FeCl2等杂质。 下列说法
       The advantages of using flashcards to build up a vocabulary are we
       The advantages of using flashcards to build up a vocabulary are well known. You can buy sets of cards, or make your own, and carry them with you wherever you go. There’s no question

最新题目