Question

the atomic mass number is __. 235 146 143 238 92 6. choose the best answer. the number of protons are __ 238 143 92 146 235

Explanation:

Step1: Recall the definition of atomic mass number

The atomic mass number \(A\) is the sum of the number of protons \(Z\) and neutrons \(N\) in an atom, \(A = Z+N\). For Uranium - 238 (\(^{238}\text{U}\)), the atomic mass number is 238.

Step2: Recall the definition of the number of protons

The atomic number \(Z\) (number of protons) of Uranium is 92.

Answer:

• For the atomic mass number: 238
• For the number of protons: 92