Answer:
Z = 60
Explanation:
The symbol of the element is not given in the question. However, we can use the information provided to determine the number of protons in the nucleus of the element.
The mass number, A, is the sum of the number of protons, Z, and the number of neutrons, N, in the nucleus of the atom. So we have:
A = Z + N
Substituting the given values, we get:
100 = Z + 40
Solving for Z, we get:
Z = 100 - 40 = 60
Therefore, the number of protons in the nucleus of this element is 60.