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Ulleksa [173]
3 years ago
8

What is the change in atomic mass number when an atom emits an alpha particle?

Physics
1 answer:
natita [175]3 years ago
6 0

Answer:

Decreases by 4

Explanation:

  • An alpha particle is made of two protons and two neutrons. An alpha decay involves the ejection of an alpha particle from the nucleus.
  • Therefore since an alpha particles is equivalent to a helium nucleus, it involves the loss of 2 protons and 2 neutrons.
  • <em><u>Hence, we can conclude that when a nucleus emits an alpha particle, the mass number or the atomic mass decreases by 4 and the atomic number decreases by 2</u></em><em><u>.</u></em>
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<h3><u>Answer;</u></h3>

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