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113 核子数
Nucleon Number
（https://www.nuclear-power.com/）
核子数
The total number of protons and neutrons in the nucleus of an atom is called the atomic mass number (also called nucleon number) of the atom and is given the symbol A. Neutron number plus atomic number equals nucleon number: N+Z=A. The difference between the neutron number and the atomic number is known as the neutron excess: D = N – Z = A – 2Z.
原子核中质子、中子的总数称为原子质量数（又称核子数），用符号A表示。中子数加原子序数等于核子数：N+Z=A。中子数和原子序数之间的差被称为中子过剩：D = N – Z = A – 2Z。
Atomic mass number (nucleon number) determines especially the atomic mass of atoms. The nucleon number is different for each different isotope of a chemical element. The nucleon number is written either after the element name or as a superscript to the left of an element’s symbol. For example, the most common isotope of carbon is carbon-12, or 12C. Note that, the unit of measure for mass is the atomic mass unit (amu). One atomic mass unit is equal to 1.66 x 10-24 grams.
原子质量数（核子数）专门确定了原子的原子质量。一种化学元素的每个不同同位素的核子数是不同的。核子数可以写在元素名称后面，也可以写成元素符号的左上标。例如，碳最常见的同位素是碳-12或12【上标】C。注意，质量的度量单位是原子质量单位（amu）。1原子质量单位等于1.66 × 10^-24克。
Besides the standard kilogram, it is a second mass standard. It is the carbon-12 atom, which, by international agreement, has been assigned a mass of 12 atomic mass units (u). The relation between the two units is one atomic mass unit is equal:
1u = 1.66 x 10-24 grams.
除了标准千克之外，还有第二种质量标准。它是碳-12原子，根据国际协议，碳-12原子的质量被赋予了12个原子质量单位（u）。这两个单位之间的关系是一个原子质量单位等于:
1u = 1.66 x 10^-24克。
One unified atomic mass unit is approximately the mass of one nucleon (either a single proton or neutron) and is numerically equivalent to 1 g/mol.
一个统一的原子质量单位大约是一个核子（一个单质子或单中子）的质量，在数值上相当于1克/摩尔。
（待续）
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