Dmitri Mendeleev and Henry Moseley developed their periodic tables about forty years apart. During that time, many discoveries in chemistry were made. Which fact was most likely discovered between the time of Mendeleev’s table and the time of Moseley’s table that helped Moseley develop his version? a. Atomic mass is the average mass of different samples of the same element. b. Different elements can have similar chemical properties even if their atomic masses are different. c. The number of protons in an atom is different than the atom’s total mass. d. Protons strongly affect an element’s atomic mass, while the electrons in atoms do not.

The fact that most likely discovered between the time of Mendeleev’s table and the time of Moseley’s table helped Moseley develop his version is as follows:

The number of protons in an atom is different than the atom’s total mass.

Thus, the correct option is C.

What is Mendeleev's periodic table?

Mendeleev's periodic table may be defined as a systematic positioning of elements on the basis of their increasing atomic mass in a table form. It also reflects similarities and fashion in the behavior of elements.

Mendeleev's periodic table helped Moseley to a major extent. All the drawbacks of Mendeleev's periodic table are shorted out by Moseley in a more efficient way.

One of them was that the number of protons in an atom is different than the atom’s total mass because the total atomic mass of an element depends on the number of protons, neutrons, and electrons. Altogether they constitute the element.

Therefore, the correct option for this question is C.

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