Combined 216: Nuclear Radiation and Radioactive Decay | 综合216：核辐射与放射性衰变

📚 Combined 216: Nuclear Radiation and Radioactive Decay | 综合216：核辐射与放射性衰变

In Edexcel A-Level Physics, nuclear radiation and radioactive decay bring together atomic structure, conservation laws and exponential mathematics. The ‘Combined 216’ revision set covers the key equations, definitions and graph skills that examiners test regularly, especially in Topic 11 Nuclear Radiation.

在 Edexcel A-Level 物理中，核辐射与放射性衰变将原子结构、守恒定律和指数数学结合在一起。”综合216″复习套题涵盖考试中经常出现的关键方程、定义和图像技能，尤其是第11单元核辐射部分。

1. Atomic Nucleus and Notation | 原子核与符号

The nucleus is described by the proton number Z and the nucleon number A. A nuclide is written as ᴬZX, where X is the chemical symbol, Z is the number of protons and A is the total number of protons plus neutrons.

原子核由质子数 Z 和核子数 A 描述。核素写作 ᴬZX，其中 X 是化学符号，Z 是质子数，A 是质子与中子的总数。

For example, ¹⁴₆C has 6 protons and 14 − 6 = 8 neutrons. In a neutral atom the number of electrons equals Z, but nuclear reactions focus only on the nucleus, so electron counts do not appear in decay equations.

例如 ¹⁴₆C 有 6 个质子和 14 − 6 = 8 个中子。在中性原子中电子数等于 Z，但核反应只关注原子核，因此电子数不会出现在衰变方程中。

Nuclear notation is essential for balancing equations. Always write the mass number above and the atomic number below the left side of the symbol, and keep these numbers consistent in every reaction.

核素符号对于配平方程至关重要。始终将质量数写在符号左上角，将原子序数写在左下角，并在每个反应中保持这些数字守恒。

2. Isotopes and Nuclides | 同位素与核素

Isotopes are atoms of the same element with the same Z but different A. They have identical chemical properties because electron configuration depends on Z, but their nuclear stability can be very different.

同位素是同一元素、质子数 Z 相同而核子数 A 不同的原子。由于电子排布取决于 Z，它们化学

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