The number of isotopes of elements with even mass number and even atomic number are ________________?
Correct answer: C. 154
- A. 280
- B. 300
- C. 154
- D. 54
Explanation
For isotopes with even atomic number and even mass number, both the proton number and neutron number are even, a combination that gives especially stable nuclei because nucleons are paired. The standard tabulated count for this classification is 154. Students may choose b if they remember a total isotope count or another parity category rather than the specific even-even group.
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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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