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14 February, 20:14

An alpha particle is composed of

A. nothing

B. two protons and two neutrons

C. one proton and no neutrons

D. one neutron no protons

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Answers (2)
  1. 14 February, 20:28
    0
    Answer: B. two protons and two neutrons

    Explanation: Alpha rays are fast moving streams of positively charged particles which are shown to be helium nuclei represented by 4He2, having a mass number of 4, i. e., having 2 protons and 2 neutrons. Mass number of an element is the sum of the number of protons and neutrons in the nucleus of an atom. A helium atom has 2 protons and 2 neutrons in its atom.
  2. 14 February, 20:43
    0
    B. Two protons and two neutrons
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