The ⁸⁰Br^- ion has

Question

The ⁸⁰Br^- ion has

Quizplus · Accepted Answer

The atomic number of an element is given by the number of protons. In this case, the ion is ⁸⁰Br^-, which means it contains sulfur (S), uranium (U), phosphorus (P), bromine (Br), and electrons (-). Counting the number of atoms of each element gives: 2S, 2U, 2P, 1Br, 46e-. The atomic number of sulfur is 16, so 2S have 32 protons. The atomic number of uranium is 92, so 2U have 184 protons. The atomic number of phosphorus is 15, so 2P have 30 protons. The atomic number of bromine is 35, so 1Br has 35 protons. Electrons have a negative charge, so the total number of protons must equal the total number of electrons. Therefore, the ion has 35 protons and 36 electrons. Neutrons can be calculated by subtracting the atomic number (i.e. number of protons) from the mass number (i.e. number of protons + number of neutrons). The mass number is not given, so it cannot be calculated, but it is clear that there are 45 neutrons in the ion (since the total number of atoms is even, and the sum of the atomic masses is odd, there must be an odd number of neutrons). Thus, choice C is the correct answer.

The 80Br- Ion Has

The ⁸⁰Br^- Ion Has