After reading the paragraph below, answer the questions that follow. Uranium is

Question

After reading the paragraph below, answer the questions that follow.

Uranium is a metallic element that is used in nuclear reactors and nuclear weapons. The vast majority of uranium found on Earth is in the form of uranium-238, an isotope with a mass number of 238, while the uranium that is used for nuclear reactors and weapons is uranium-235, an isotope with a mass number of 235.

If the atomic mass of uranium is 92, how many neutrons does an atom of uranium-235 have in its nucleus?

A) 92

B) 143

C) 146

D) 235

Explanation / Answer

Answer:
Option B is correct.

Explanation:
Atomic number = Number of protons in the nucleus
Mass number = Number of protons + Number of neutrons
Mass number = Atomic number + Number of neutrons

Number of neutrons = Mass number - Atomic number

Atomic number of Uranium = 92
Atomic number of Uranium-235 = 235

Mass number = 235 - 92
= 143

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