Q104 / 180 · AIIMS 2016 · Physics

An atom of mass number 15 and atomic number 7 captures an $\alpha$-particle and then emits a proton. The mass number and atomic number of the resulting atom will be respectively

  • A
    14 and 2
  • B
    15 and 3
  • C
    16 and 4
  • Correct answer
    D
    18 and 8

Solution

According to the law of conservation of charge, we get $7+2=1+Z \Rightarrow Z=8$ According to the law of conservation of mass, we get $15+4=1+A \Rightarrow A=18$ Hence, the resulting atom has mass number 18 and atomic number 8 .

Hence, the correct answer is option: 'D'.

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