Question

Uranium atoms each have 92 protons. How many protons does each U-238 atom have?

Answer 1

Answer: The correct answer is Option A.

Explanation:

Atomic number is defined as the number of protons or electrons that are present in a neutral atom. It is represented by Z.

Atomic number = number of protons = number of electrons

Mass number is defined as the sum of number of protons and neutrons that are present in an atom. It is represented by A.

Mass number = Number of protons + Number of neutrons

We are given an isotopic representation of $_{92}^{238}\textrm{U}$

Number of protons = 92

Mass number = 238

Number of neutrons = 238 - 92 = 146

For every uranium atom, number of protons will be 92

Hence, the correct answer is Option A.

Answer 2

A.92 all Uranium atoms contain the same amount of protons