During the process of nuclear disintegration, when alpha particle emission occurs, atomic no. of the atom changes by _ and its mass number changes by _.
Correct answer: B. Two units ... four units
- A. One unit ... one unit
- B. Two units ... four units
- C. Two units ... three unit
- D. Two units ... two units
Explanation
Alpha particles are made of 2 protons and 2 neutrons. Alpha emission results in mass number to reduce by 4 and atomic number to reduce by 2, hence the answer to this question is B.
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Atomic nuclei contain protons and neutrons, with nuclear size, mass defect and binding energy describing their stability. The work covers alpha, beta and gamma decay, decay equations, half-life and decay rate, along with radiation safety and medical applications such as imaging, radiotherapy and tracers.
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