1. Why do electrons keep moving around the nucleus and not away from the atom ?
2. Why do some chemical symbols have one letter and some have two or three letters ?
** 回答時的文法不要錯 ...
** 字數不限 , 但不要太多 , 也不要太少 ...
2 條 物理的問題 ( 英文 ) 急急急 !!!
2008-03-06 12:12 am
回答 (1)
2008-03-06 9:39 am
✔ 最佳答案
Q1.Electrons are attracted by the positvely charged nucleus at the center of the atom.
Hence, a centripetal force acting on electrons, causing them moving around the nucleus.
Q2.
It is NOT a physics question!!!!
There are over 100 different elements in nature!!
If Chemical symbols MUST have only one letter, then maximum 26 symbols (i.e. A~Z) can be used.
e.g. C for Carbon & Ca for Calcium, we CANNOT use C to represent calcium since this will mix with element carbon.
收錄日期: 2021-04-13 15:14:38
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080305000051KK01158