eg.氦
4
He
2
2p
2e
2n
(質量數)相對質量=4
點解會係=4既?? (唔係好明)
相對質量既問題
2008-03-27 8:16 pm
回答 (2)
2008-03-27 9:40 pm
✔ 最佳答案
原子很多時的重量都不包括電子,因為它太輕。另外,相對質量其實是指該原素跟碳原子重量的比較,碳的相對原子質量是12,跟He 比較下,即是3粒的He原子才等於1粒的碳原子。
2008-03-27 9:38 pm
relative mass for e is approximately 0
relative mass for p and n is approximately the same.
2p + 2e + 2n is approximately 2 + 0 + 2 = 4
relative mass for p and n is approximately the same.
2p + 2e + 2n is approximately 2 + 0 + 2 = 4
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080327000051KK01101