mass number = number of proton + number of neuton
neutron*
also, that two electrons of helium are in the 1S subshell
they rotate with different direction so that less repulsion obtain
actually in most of the situations, atomic mass does no use
有冇人可以幫我釋返做中文既chem
2008-03-28 5:14 am
回答 (1)
2008-03-29 6:18 am
✔ 最佳答案
質量數=質子數+子中數*同時，氦的兩粒電子均處於1s亞層，他們以不同方向轉動以減少排斥
事實上在大部份情況，原子質量不會用作
質量數同相對質量不一樣，最簡單的分別是質量數有單位而相對質量沒有
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080327000051KK03730