What is the Difference Between Mendeleev and Moseley Periodic Table?

The main difference between Mendeleev's and Moseley's periodic tables lies in the arrangement of elements. Mendeleev arranged elements ascendingly according to atomic masses, while Moseley arranged them ascendingly according to atomic numbers. Here are some key differences between the two periodic tables:

1. Arrangement of elements: Mendeleev's periodic table is based on the atomic masses of chemical elements, while Moseley's periodic table is based on their atomic numbers.
2. Periodic Law: Mendeleev's periodic table is based on the idea that when elements are arranged in order of increasing atomic mass, there is a periodic repetition of their chemical and physical properties. Moseley's periodic table is based on the concept that when elements are arranged in order of increasing atomic number, there is a periodic repetition of their chemical and physical properties.
3. Discovery of Moseley: The modern periodic table proposed by Moseley in 1913 was a significant improvement over Mendeleev's periodic table. Moseley's research demonstrated that the atomic number has a strong experimental basis in physics, and this discovery was a significant milestone in the development of the periodic table as we know it today.

In summary, Mendeleev's periodic table is based on atomic masses, while Moseley's periodic table is based on atomic numbers. This distinction in the arrangement of elements results in different organization principles for the two periodic tables.

Comparative Table: Mendeleev vs Moseley Periodic Table

Here is a table comparing the differences between Mendeleev's and Moseley's periodic tables:

Mendeleev's periodic table is based on atomic mass, while Moseley's table is based on atomic number. This difference in the arrangement of elements results in Moseley's periodic table showing repetitive properties after regular intervals, unlike Mendeleev's table. Additionally, Moseley's table has separate positions for metals, nonmetals, and semimetals, and transition elements are classified in a separate block, which is not the case in Mendeleev's table.