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13.Nuclei
easy
Which of the following is true for a sample of isotope containing ${U^{235}}$ and ${U^{238}}$
A
Number of neutron are same in both
B
Number of proton, electron and neutron are same in both
C
Contain same number of protons and electrons but $U^{238}$ contains $3 $ more neutrons than $U^{235}$
D
$U^{238}$ contains $3$ less neutron then $U^{235}$
Solution
Natural Uranium contains $3$ radioactive isotopes $U ^{234}, U ^{235}$ and $U ^{238}$
$U ^{238}$ has a mass number
(proton $92+$ neutron $146$) $=238$
$U ^{235}$ has mass number (proton $92+$ neutron $143)$ $=235$
Hence we can say that both contain the same number of protons and electrons
but $U ^{238}$ contains three more neutrons than $U ^{235}$
Standard 12
Physics
