How many protons, neutrons, and electrons are contained in uranium-238?
A) 238 protons, 92 neutrons, 238 electrons
B) 119 protons, 119 neutrons, 232 electrons
C) 92 protons, 146 neutrons, 92 electrons
D) 238 protons, 238 neutrons, 119 electrons
E) more data needed

Question

Quizplus · Accepted Answer

Uranium-238 has an atomic number of 92, which means it contains 92 protons and 92 electrons (since atoms are neutral, the number of protons and electrons is always the same). The atomic mass of uranium-238 is 238, which means it contains 146 neutrons. Therefore, the answer is C.

How Many Protons, Neutrons, and Electrons Are Contained in Uranium-238