The History of the Periodic Table by Meyer and Mendeleev revolutionized our understanding of chemical elements through systematic organization based on properties and atomic mass, later refined by Moseley's atomic number concept.
- Meyer and Mendeleev independently grouped elements by similar properties and increasing atomic mass, leaving spaces for undiscovered elements
- The modern periodic table is organized by atomic number rather than atomic mass, following Moseley's Periodic Law
- Elements are categorized into main groups including metals (80%), non-metals, and metalloids
- Characteristics of alkali metals and noble gases represent opposite ends of reactivity spectrum
- The Differences between atomic mass and atomic number in periodic table proved crucial for proper element arrangement
