nuclear charge number

例句：

1. 1.The scientists are trying to determine the exact number of neutrons in the nucleus.
   科学家们正在试图确定原子核中中子的具体数量。
2. 2. This experiment is designed to measure the precise number of atoms in a sample.
   这个实验旨在测量样品中原子的精确数量。
3. 3. The researcher found that the number of elements in the sample was significantly different from what was expected.
   研究人员发现样本中的元素数量与预期显著不同。