How many protons (p), neutrons (n), and electrons (e) are in an atom of ²³⁵U? A) 92 p, 146 n, 92 e B) 92 p, 143 n, 92 e C) 92 p, 92 n, 146 e D) 92 p, 92 n, 92 e E) 92 p, 51 n, 92 e

Question

Quizplus · Accepted Answer

- S has 1 proton and 1 electron (atomic number)
- U has 1 proton and 1 electron (atomic number) and 235 neutrons (mass number - atomic number)
- P has 1235 protons and 1235 electrons (atomic number) and 143 neutrons (mass number - atomic number)
Therefore, the total number of protons is 92 (1+1+1235+1+1235+1), the total number of neutrons is 143+235=378, and the total number of electrons is 92 (1+1+1235+1+1+1). The only answer choice that matches these values is B.

How Many Protons (P), Neutrons (N), and Electrons (E) Are