If ²³⁵U has 92 protons, how many neutrons does it have? A)25 B)92 C)143 D)235

Question

Quizplus · Accepted Answer

The number after the element's symbol represents its Atomic Mass, which is the total number of protons and neutrons in an atom's nucleus. Therefore, if the atom has 92 protons, we need to find the number of neutrons that will add up to 143 to reach an atomic mass of 235. 
235 (atomic mass) - 92 (atomic number) = 143 (number of neutrons)

If 235U Has 92 Protons, How Many Neutrons Does It

If ²³⁵U Has 92 Protons, How Many Neutrons Does It