Question

how many neutrons are in uranium - 238 if it has 92 protons?
146
238
92
184

Explanation:

Step1: Recall atomic mass formula

Atomic mass = protons + neutrons.

Step2: Rearrange for neutrons

Neutrons = Atomic mass - protons.

Step3: Substitute values

Uranium - 238 has atomic mass 238 and 92 protons. So neutrons = 238 - 92.

Step4: Calculate

238 - 92 = 146.

Answer:

146