问题
选择题
X、Y-、Z+三种微粒的电子层结构相同,则一定不能相等的是 [ ]
A.中子数
B.质量数
C.电子数
D.核电荷数
答案
答案:D
X、Y-、Z+三种微粒的电子层结构相同,则一定不能相等的是 [ ]
A.中子数
B.质量数
C.电子数
D.核电荷数
答案:D
从方框中选择合适的词,将句子补充完整,每词限用一次。 | |
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1. What_____bowl of rice would he like? 2. They don't have green tea,but they have_____. 3. What kind of_____would you like,Tom? 4. Mary would like a_____bowl of noodles. 5. I'd like mutton and_____noodles.I think they are very delicious. |