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1. (6 分) 原子核 $\mathrm{z}^{\mathrm{A}} \mathrm{X}$ 与㲴核 ${ }_{1}{ }^{2} \mathrm{H}$ 反应生成一个 $\alpha$ 粒子和一个质子. 由此可知(

Gaokao · Physics · previous-year question

  1. A.$A=2, Z=1$
  2. B.$\mathrm{A}=2, \mathrm{Z}=2$
  3. C.$\mathrm{A}=3, \mathrm{Z}=3$
  4. D.$\mathrm{A}=3, \mathrm{Z}=2$correct

Answer

D. $\mathrm{A}=3, \mathrm{Z}=2$

Explanation

解:写出该反应的方程有: $\mathrm{z}^{\mathrm{A} X}{ }^{\mathrm{A}}{ }_{1}{ }^{2} \mathrm{H} \rightarrow{ }_{2}{ }^{4} \mathrm{He}+{ }_{1}{ }^{1} \mathrm{H}$ 应用质量数与电荷数的守恒得: $A+2=4+1, Z+1=2+1$, 解得 $A=3, Z=2$, 故 $A B C$ 错误, D 正确。 故选:D。

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