Question

The difference between ${\text{U}}^{235}$ and ${\text{U}}^{238}$ atom is that ${\text{U}}^{238}$ contains $3$ more

• A. protons
• B. protons and $3$ more electrons
• C. neutrons and $3$ more electrons
• D. neutrons

Answer 1

The correct option is D

neutrons

Explanation

1. Isotopes are atoms of the same element with the same atomic number but with a different mass number.
2. Since two isotopes have the same atomic number, they have an equal number of protons in the nucleus. The only difference occurs in the number of neutrons.
3. ${\text{U}}^{235}$and ${\text{U}}^{238}$are isotopes. Therefore, they have the same number of electrons and protons.
4. And the difference in the number of neutrons is,$238-235=3$.

Hence, the correct option is (d).