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U-235 is the isotope that is used to make atomic bombs. All you need is about 125 lbs of U-235.

How many neutrons are present in this isotope? (Look at a periodic table to see the atomic number for U)

A. 238
B. 125
C. 146
D. 92

Answer :

Final answer:

U-235, the isotope used to make atomic bombs, contains 143 neutrons.

Explanation:

To determine the number of neutrons in an isotope, you need to subtract the atomic number from the mass number. In this case, U-235 has an atomic number of 92, so it contains 235 - 92 = 143 neutrons.

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