What is the mass number of uranium and how did you find it

Answer 1

The mass number is given under the element in the periodic table. Uranium has an atomic #92 which is found at the top of the box in the periodic table, below that you see 238. The 238 is the mass number of the most common isotope

This means that:

# neutrons= 238-92 = 146

# protons = 92

# neutrons = 92