What is difference and similarity of Mendeleev's period classification and newland octvave
Answer (1)
Feature Mendeleev's Periodic Table Newland's Law of Octaves Scope Included a much larger number of elements. Limited to the elements known at the time (only about 56). Arrangement Arranged elements based on both atomic mass and chemical properties, allowing for gaps and adjustments. Strictly arranged elements in octaves (groups of eight). Predictive Power Successfully predicted the existence and properties of undiscovered elements (e.g., gallium, germanium). Failed to predict new elements and broke down for heavier elements. Accuracy More accurate and comprehensive than Newland's system. Less accurate and less comprehensive; many elements didn't fit the octave pattern. Exceptions Allowed for exceptions and adjustments to accommodate discrepancies. Did not account for exceptions or irregularities. Structure Arranged elements in rows (periods) and columns (groups) based on recurring properties. Arranged elements in a single sequence. Acceptance Widely accepted and formed the basis for the modern periodic table. Largely rejected by the scientific community. In essence, Newland's Law of Octaves was a rudimentary attempt that highlighted the periodic nature of elemental properties but lacked the sophistication and predictive power of Mendeleev's periodic table. Mendeleev's system, while not perfect (atomic number, not mass, is the true organizing principle), was a significant advancement that laid the foundation for our modern understanding of the periodic table.
