235k views
21 votes
Determine the number of neutrons in 20 grams Uranium-238

User Yohan Zhou
by
3.7k points

1 Answer

10 votes

Answer:

146 neutrons

Step-by-step explanation:

The atomic number of uranium (see periodic table) is 92, and the mass number of the isotope is given as 238. Therefore, it has 92 protons, 92 electrons, and 238 — 92 : 146 neutrons.

User Risel
by
4.8k points