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10 December, 13:09

Which particle has a mass of approximately 1 atomic mass unit?

A) an alpha particle

B) a beta particle

C) an electron

D) a neutron

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Answers (1)
  1. 10 December, 14:34
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    The answer is D) a neutron.

    When we say an atom's mass is, like 5 atomic mass units actually we are saying that the total number of the neutrons and protons in its nucleus is 5.

    The mass of a neutron and a proton is each one atomic mass unit.

    Mass of a neutron is approximately 1 atomic mass unit.
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