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

View answer & explanation

Correct answer is B

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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