If a nucleus with 198 atomic masses releases an alpha particle, its new mass becomes _.
Correct answer: A. 194
- A. 194
- B. 202
- C. 200
- D. None of these
Explanation
When a nucleus emits an alpha particle, these changes happen: the mass number decreases by 4, and the atomic number decreases by 2. So 198-4 gives 194.
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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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