Question

Henry Moseley was able to correct minor discrepancies with Mendeleev's Periodic Table. Describe key differences between Moseley's and Mendeleev's Periodic Laws, key similarities between the organization of

their Periodic Tables, and use two elements as evidence, other than
Tellurium and lodine, to back up Moseley's claim. *
Response includes: Moseley's/Mendeleev's Periodic Laws, common trends in organization
between old and modern Periodic Tables, and evidence from the modern Periodic Table to
support the current Periodic Law.

Answer 1

Mendeleev and Meyer both contributed to the periodic table, but Moseley's work showed that elements are arranged based on atomic number, not atomic mass. The modern periodic table is organized according to increasing atomic number, with similar elements grouped together. An example of evidence supporting Moseley's claim is the positions of tellurium and iodine in the periodic table.

Step-by-step explanation:

Mendeleev and Meyer both contributed to the development of the periodic table, but there were some key differences in their approaches. Mendeleev arranged the elements based on increasing atomic mass and left gaps in his table for undiscovered elements. Meyer also arranged elements based on atomic mass and used atomic volume to determine periodic variations. However, Moseley's work showed that the periodic arrangement of elements is determined by atomic number, not atomic mass.

The modern periodic table is organized in order of increasing atomic number, with elements with similar properties appearing in the same group. One example of evidence supporting Moseley's claim is the position of tellurium (atomic number 52) and iodine (atomic number 53) in the periodic table. Despite tellurium having a greater atomic mass, it is placed before iodine because of its lower atomic number.