outer-shell electron

• 外层电子

outer-shell electron的用法和样例：

例句

1. The outermost electron is shielded from the nucleus.
   原子核对最外层电子的作用受到屏蔽。
2. An ion is an atom that, through electron transference, has lost or gained electrons in its outer shell.
   离子就是经过电子转移而失去或获得外层电子的原子。