中子数
![](/Images/godic/202501/29/CNO_Cycle_zh_hant.svg5802.png")
![This diagram shows the half-life (T½) of various isotopes with Z protons and neutron number N.](/Images/godic/202501/29/Isotopes_and_half-life.svg5802.png")
中子数是一核种所具有中子的数目，常以符号N作标示。中子数会影响物质的物理性质，例如：锕系元素具有奇数中子的，常为可裂变物质，偶数则物性较安定，可裂变物质较少。
中子数很少被独自被标记在化学式中，常会搭配质子数或质量数出现。例如：
| 元素 | C |
| 同位素/核种 | 14C |
| 加上原子序 | 14 6C |
| 加上中子数 | 14 6C 8 |
Neutron number
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Neutron number 中子数
The neutron number, symbol N, is the number of neutrons in a nuclide.
Atomic number (proton number) plus neutron number equals mass number: Z+N=A. The difference between the neutron number and the atomic number is known as the neutron excess: D = N - Z = A - 2Z.
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