Question

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 mendeleevs table and the time of moseleys table that helped moseley develop his version? o atomic mass is the average mass of different samples of the same element. o different elements can have similar chemical properties even if their atomic masses are different. o the number of protons in an atom is different than the atoms total mass. o protons strongly affect an elements atomic mass, while the electrons in atoms do not.

Explanation:

Moseley's periodic table was based on atomic number (number of protons). The discovery that the number of protons in an atom is different from the atom's total mass was crucial as it led to a more accurate organization of elements compared to Mendeleev's table which was based more on atomic mass. The other options were either known before or not as fundamental to Moseley's work.

Answer:

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