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Two isotopes of uranium are designed as \(^{238}U\) and \(^{235}U\). The numbers 238 and 235...

Physics
WAEC 2009
Two isotopes of uranium are designed as \(^{238}U\) and \(^{235}U\). The numbers 238 and 235 represent their
  • A. atomic numbers
  • B. nucleon numbers
  • C. proton numbers
  • D. neutron numbers
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Correct Answer: Option B
Explanation
neutrons + protons = the nucleus or mass numbers.

U-238 has mass number(proton 92 + neutron 146=238)
U-235 has mass number (proton 92 + neutron 143 =235)
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