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In a nuclear reaction, if a nucleus emits an alpha particle, what happens to its

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Question: In a nuclear reaction, if a nucleus emits an alpha particle, what happens to its atomic number? (2023)

Options:

  1. It increases by 2
  2. It decreases by 2
  3. It remains the same
  4. It decreases by 4

Correct Answer: It decreases by 2

Exam Year: 2023

Solution: 

An alpha particle consists of 2 protons and 2 neutrons, so the atomic number decreases by 2.

In a nuclear reaction, if a nucleus emits an alpha particle, what happens to its

Practice Questions

Q1
In a nuclear reaction, if a nucleus emits an alpha particle, what happens to its atomic number? (2023)
  1. It increases by 2
  2. It decreases by 2
  3. It remains the same
  4. It decreases by 4

Questions & Step-by-Step Solutions

In a nuclear reaction, if a nucleus emits an alpha particle, what happens to its atomic number? (2023)
  • Step 1: Understand what an alpha particle is. An alpha particle is made up of 2 protons and 2 neutrons.
  • Step 2: Know that the atomic number of an element is determined by the number of protons in its nucleus.
  • Step 3: When a nucleus emits an alpha particle, it loses 2 protons.
  • Step 4: Since the atomic number decreases by the number of protons lost, the atomic number will decrease by 2.
  • Alpha Decay – In alpha decay, a nucleus emits an alpha particle, which consists of 2 protons and 2 neutrons, resulting in a decrease of the atomic number by 2.
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