The charge on alpha particles is________________?
Correct answer: B. Plus two
- A. Plus one
- B. Plus two
- C. Minus two
- D. Minus one
Explanation
An alpha particle is a helium nucleus containing two protons and two neutrons, so its net charge is +2 elementary charges, written +2e. The two positive proton charges produce this result, while the neutrons contribute no charge. The likely trap is option a, which incorrectly counts the alpha particle as having only one proton.
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About Composition of Atomic Nuclei
Atomic nuclei contain positively charged protons and electrically neutral neutrons, collectively called nucleons. Questions use atomic number, mass number and nuclear notation to identify isotopes, isobars and isotones, and may connect nuclear composition with nuclear charge, mass defect, binding energy and the stability of the nucleus.
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