The atomic number of the isotope ²³⁸U of uranium is 92. The nucleus of this isotope contains A) 92 protons and 146 neutrons. B) 92 protons, 54 neutrons, and 92 electrons. C) 184 protons, 92 electrons, and 54 neutrons. D) 146 protons and 92 neutrons.

Question

Quizplus · Accepted Answer

The atomic number, which is 92 for uranium, indicates the number of protons in the nucleus. The mass number (238 in this case) minus the atomic number gives the number of neutrons (238 - 92 = 146). Therefore, the nucleus contains 92 protons and 146 neutrons.

The Atomic Number of the Isotope 238U of Uranium Is

The Atomic Number of the Isotope ²³⁸U of Uranium Is