How many neutrons are present in 92U238?

92 238 146 330

146

A nucleus is represented as ZXA where Z is the number of protons (called atomic number), A is the sum of number of protons (Z) and number of neutrons (N) and is called mass number. ∴ Number of neutrons, N = A - Z For example, 92U238 has 92 protons, 238 - 92 = 146 neutrons and 238 nucleons (protons + neutrons).