valence mumber

例句：

1. 1. The molecule's valence electrons are responsible for its chemical properties.
   该分子的价电子对其化学性质负责。
2. 2. The valence electrons in the compound play a crucial role in its stability.
   化合物中的价电子在稳定性中起着关键作用。
3. 3. The valence electrons of the noble gases are highly stable and do not react with other elements.
   稀有气体的价电子非常稳定，不会与其他元素反应。