halogen atom造句

例句与造句

1. halogen atoms contain seven electrons in their valence shell .
   卤原子在它们的介电子层含有七个电子。
2. halogen atoms contain seven electrons in their valence shell, and, consequently, are monovalent .
   卤原子在它们的价电子层含有七个电子，因此是一价的。
3. It's difficult to find halogen atom in a sentence. 用halogen atom造句挺难的