Question

how many neutrons does uranium-235 have? 235 u 92 92 143 146 235

Explanation:

Step1: Recall atomic number and mass - number relationship

The mass - number (A) of an atom is the sum of the number of protons (Z) and neutrons (N), i.e., $A = Z+N$.

Step2: Identify the mass - number and atomic number of Uranium - 235

For Uranium - 235, the mass - number $A = 235$ and the atomic number $Z = 92$ (since the atomic number of uranium is 92).

Step3: Calculate the number of neutrons

We can find the number of neutrons $N$ by rearranging the formula $N=A - Z$. Substituting $A = 235$ and $Z = 92$ into the formula, we get $N=235 - 92=143$.

Answer:

143