Question

What is one significant difference between the modern periodic table and Mendeleev's periodic table that contributes to the modern periodic table's perceived superiority?

A) The modern periodic table is organized based on atomic number, while Mendeleev's periodic table was organized based on atomic mass.
B) The modern periodic table is organized by the number of valence electrons, while Mendeleev's periodic table was organized by the number of electron shells.
C) The modern periodic table includes more elements than Mendeleev's periodic table.
D) The modern periodic table is organized by the number of protons, while Mendeleev's periodic table was organized by the number of neutrons.

Answer 1

The modern periodic table arranges elements by atomic number, rather than atomic mass as in Mendeleev's table, correcting placement discrepancies and contributing to its superiority.

Step-by-step explanation:

One significant difference between the modern periodic table and Mendeleev's periodic table that contributes to the modern periodic table's perceived superiority is that the modern periodic table is organized based on atomic number, while Mendeleev's periodic table was organized based on atomic mass. This is option A. The use of atomic number rather than atomic mass corrected discrepancies in the arrangement of elements, such as the placement of tellurium and iodine. Mendeleev’s periodic table did accurately organize elements in groups with similar properties and successfully predicted the existence and properties of undiscovered elements, but organizing elements by atomic number allowed for a more consistent and accurate placement.