Which of the following statements about isotopes is correct ?
Correct answer: C. Isotopes with even atomic number and even mass number are abundant
- A. Isotopes with odd atomic number are abundant
- B. Isotopes with odd atomic number and even mass number are abundant
- C. Isotopes with even atomic number and even mass number are abundant
- D. Isotopes with even atomic number and odd mass no are abundant
Explanation
Nuclei with even atomic number and even mass number have both an even proton number and an even neutron number, so the nucleons can be paired and the nucleus is relatively stable. Consequently, this even-even group is the most abundant among stable isotopes. Students may choose b because they remember that some odd-even combinations occur, but those are less stable overall than even-even nuclei.
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About Moles and Avogadro's Number
The mole connects the microscopic number of particles with measurable mass, using Avogadro's number, 6.022 × 10²³ particles per mole. Questions involve molar mass, conversion between mass, moles and particles, percentage composition, empirical and molecular formulas, and distinguishing atoms, molecules, ions and formula units.
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