🧩 By the end of this lesson, you’ll be able to:

• Define the Periodic Table and its purpose:
  • A systematic arrangement of all known chemical elements
  • Organized by atomic number, electron configuration, and recurring chemical properties
  • Serves as a reference for identifying and comparing elements
• Explore the history of its development:
  • Early attempts by scientists like Döbereiner and Newlands to group elements
  • Dmitri Mendeleev’s breakthrough in 1869: arranged elements by atomic mass and predicted undiscovered ones
  • Modern table refined by Henry Moseley, who reordered elements by atomic number
• Understand why the Periodic Table is essential:
  • Groups elements with similar properties into families (e.g., noble gases, alkali metals)
  • Reveals periodic trends such as atomic radius, ionization energy, and electronegativity
  • Provides a framework for understanding element reactivity, bonding behavior, and compound formation
• Use the table to predict element properties:
  • Identify metals, nonmetals, and metalloids
  • Anticipate how elements will interact based on their position
  • Understand why elements in the same group often form similar compounds
• Apply the Periodic Table to chemical reactions:
  • Determine likely reactants and products
  • Predict reaction types (e.g., synthesis, decomposition, displacement)
  • Understand valence electrons and bonding tendencies