Hydrogen
回答 (1)
2013-06-15 2:04 am
✔ 最佳答案
Hydrogen belongs to the 1st Period of the Periodic Table.This is because there is one shell of electrons in each hydrogen atom in ground state.
參考: 土扁
收錄日期: 2021-04-13 19:30:52
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https://hk.answers.yahoo.com/question/index?qid=20130614000051KK00203